diff --git a/samples/ControlCatalog/App.xaml.cs b/samples/ControlCatalog/App.xaml.cs
index 130c000440..0baa6589c6 100644
--- a/samples/ControlCatalog/App.xaml.cs
+++ b/samples/ControlCatalog/App.xaml.cs
@@ -11,10 +11,6 @@ namespace ControlCatalog
     {
         public static Styles FluentDark = new Styles
         {
-            new StyleInclude(new Uri("avares://ControlCatalog/Styles"))
-            {
-                Source = new Uri("avares://Avalonia.Themes.Default/Accents/BaseDark.xaml")
-            },
             new StyleInclude(new Uri("avares://ControlCatalog/Styles"))
             {
                 Source = new Uri("avares://Avalonia.Themes.Fluent/Accents/FluentDark.xaml")
@@ -23,10 +19,6 @@ namespace ControlCatalog
 
         public static Styles FluentLight = new Styles
         {
-            new StyleInclude(new Uri("avares://ControlCatalog/Styles"))
-            {
-                Source = new Uri("avares://Avalonia.Themes.Default/Accents/BaseLight.xaml")
-            },
             new StyleInclude(new Uri("avares://ControlCatalog/Styles"))
             {
                 Source = new Uri("avares://Avalonia.Themes.Fluent/Accents/FluentLight.xaml")
@@ -61,7 +53,7 @@ namespace ControlCatalog
         {
             AvaloniaXamlLoader.Load(this);
 
-            Styles.Insert(0, FluentLight);
+            Styles.Insert(0, FluentDark);
         }
 
         public override void OnFrameworkInitializationCompleted()
diff --git a/samples/ControlCatalog/Pages/BorderPage.xaml b/samples/ControlCatalog/Pages/BorderPage.xaml
index 8133d0e408..b8fd3ad9a4 100644
--- a/samples/ControlCatalog/Pages/BorderPage.xaml
+++ b/samples/ControlCatalog/Pages/BorderPage.xaml
@@ -12,24 +12,24 @@
       <Border BorderBrush="{DynamicResource ThemeAccentBrush}" BorderThickness="2" Padding="16">
         <TextBlock>Border</TextBlock>
       </Border>
-      <Border Background="{DynamicResource ThemeAccentBrush2}" 
-              BorderBrush="{DynamicResource ThemeAccentBrush}" 
+      <Border Background="{DynamicResource SystemAccentColorDark1}" 
+              BorderBrush="{DynamicResource SystemAccentColor}" 
               BorderThickness="4" 
               Padding="16">
         <TextBlock>Border and Background</TextBlock>
       </Border>
-      <Border BorderBrush="{DynamicResource ThemeAccentBrush}"
+      <Border BorderBrush="{DynamicResource SystemAccentColor}"
               BorderThickness="4" 
               CornerRadius="8"
               Padding="16">
         <TextBlock>Rounded Corners</TextBlock>
       </Border>
-      <Border Background="{DynamicResource ThemeAccentBrush2}"
+      <Border Background="{DynamicResource SystemAccentColor}"
               CornerRadius="8"
               Padding="16">
         <TextBlock>Rounded Corners</TextBlock>
       </Border>
-      <Border BorderBrush="{DynamicResource ThemeAccentBrush2}" Width="100" Height="100"
+      <Border Width="100" Height="100"
               BorderThickness="0"
               Background="White"
               CornerRadius="100" ClipToBounds="True">
diff --git a/samples/ControlCatalog/Pages/ButtonPage.xaml b/samples/ControlCatalog/Pages/ButtonPage.xaml
index 74073bffa6..a4427c70c5 100644
--- a/samples/ControlCatalog/Pages/ButtonPage.xaml
+++ b/samples/ControlCatalog/Pages/ButtonPage.xaml
@@ -12,7 +12,7 @@
       <StackPanel Orientation="Vertical" Spacing="8" Width="200">
         <Button>Standard XAML Button</Button>
         <Button Foreground="White">Foreground</Button>
-        <Button Background="{DynamicResource ThemeAccentBrush}">Background</Button>
+        <Button Background="{DynamicResource SystemAccentColor}">Background</Button>
         <Button IsEnabled="False">Disabled</Button>
         <Button Content="Re-themed">
           <Button.Styles>
@@ -32,10 +32,10 @@
 
       <StackPanel Orientation="Vertical" Spacing="8" Width="150">
         <Button BorderThickness="0">No Border</Button>
-        <Button BorderBrush="{DynamicResource ThemeAccentBrush}">Border Color</Button>
-        <Button BorderBrush="{DynamicResource ThemeAccentBrush}" BorderThickness="4">Thick Border</Button>
-        <Button BorderBrush="{DynamicResource ThemeAccentBrush}" BorderThickness="4" IsEnabled="False">Disabled</Button>
-        <Button BorderBrush="{DynamicResource ThemeAccentBrush}" KeyboardNavigation.IsTabStop="False">IsTabStop=False</Button>
+        <Button BorderBrush="{DynamicResource SystemAccentColor}">Border Color</Button>
+        <Button BorderBrush="{DynamicResource SystemAccentColor}" BorderThickness="4">Thick Border</Button>
+        <Button BorderBrush="{DynamicResource SystemAccentColor}" BorderThickness="4" IsEnabled="False">Disabled</Button>
+        <Button BorderBrush="{DynamicResource SystemAccentColor}" KeyboardNavigation.IsTabStop="False">IsTabStop=False</Button>
       </StackPanel>
     </StackPanel>    
   </StackPanel>
diff --git a/samples/ControlCatalog/Pages/ComboBoxPage.xaml b/samples/ControlCatalog/Pages/ComboBoxPage.xaml
index 486cc55d44..369f703718 100644
--- a/samples/ControlCatalog/Pages/ComboBoxPage.xaml
+++ b/samples/ControlCatalog/Pages/ComboBoxPage.xaml
@@ -16,7 +16,7 @@
       <ComboBox SelectedIndex="0">
         <ComboBoxItem>
           <Panel>
-            <Rectangle Fill="{DynamicResource ThemeAccentBrush}"/>
+            <Rectangle Fill="{DynamicResource SystemAccentColor}"/>
             <TextBlock Margin="8">Control Items</TextBlock>
           </Panel>
         </ComboBoxItem>
diff --git a/samples/ControlCatalog/Pages/ContextMenuPage.xaml b/samples/ControlCatalog/Pages/ContextMenuPage.xaml
index 8f147638b5..8ccd8e97f7 100644
--- a/samples/ControlCatalog/Pages/ContextMenuPage.xaml
+++ b/samples/ControlCatalog/Pages/ContextMenuPage.xaml
@@ -9,7 +9,7 @@
               Margin="0,16,0,0"
               HorizontalAlignment="Center"
               Spacing="16">
-            <Border Background="{DynamicResource ThemeAccentBrush}"
+            <Border Background="{DynamicResource SystemAccentColor}"
                     Margin="16"
                     Padding="48,48,48,48">
                 <Border.ContextMenu>
@@ -34,7 +34,7 @@
                 </Border.ContextMenu>
                 <TextBlock Text="Defined in XAML"/>
             </Border>
-            <Border Background="{DynamicResource ThemeAccentBrush}"
+            <Border Background="{DynamicResource SystemAccentColor}"
                     Margin="16"
                     Padding="48,48,48,48">
                 <Border.ContextMenu>
diff --git a/samples/ControlCatalog/Pages/DragAndDropPage.xaml b/samples/ControlCatalog/Pages/DragAndDropPage.xaml
index 65a798e53c..c22cf68b68 100644
--- a/samples/ControlCatalog/Pages/DragAndDropPage.xaml
+++ b/samples/ControlCatalog/Pages/DragAndDropPage.xaml
@@ -10,15 +10,15 @@
                 HorizontalAlignment="Center"
                 Spacing="16">
             <StackPanel>
-                <Border BorderBrush="{DynamicResource ThemeAccentBrush}" BorderThickness="2" Padding="16" Name="DragMeText">
+                <Border BorderBrush="{DynamicResource SystemAccentColor}" BorderThickness="2" Padding="16" Name="DragMeText">
                   <TextBlock Name="DragStateText">Drag Me</TextBlock>
                 </Border>
-                <Border BorderBrush="{DynamicResource ThemeAccentBrush}" BorderThickness="2" Padding="16" Name="DragMeCustom">
+                <Border BorderBrush="{DynamicResource SystemAccentColor}" BorderThickness="2" Padding="16" Name="DragMeCustom">
                   <TextBlock Name="DragStateCustom">Drag Me (custom)</TextBlock>
                 </Border>
             </StackPanel>
 
-            <Border Background="{DynamicResource ThemeAccentBrush2}" Padding="16" 
+            <Border Background="{DynamicResource SystemAccentColorDark1}" Padding="16" 
                     DragDrop.AllowDrop="True">
                 <TextBlock Name="DropState">Drop some text or files here</TextBlock>
             </Border>
diff --git a/samples/ControlCatalog/Pages/LayoutTransformControlPage.xaml b/samples/ControlCatalog/Pages/LayoutTransformControlPage.xaml
index 446dfd7ce1..8cf3610b47 100644
--- a/samples/ControlCatalog/Pages/LayoutTransformControlPage.xaml
+++ b/samples/ControlCatalog/Pages/LayoutTransformControlPage.xaml
@@ -11,10 +11,10 @@
           RowDefinitions="24,Auto,24"
           HorizontalAlignment="Center"
           VerticalAlignment="Center">
-      <Border Background="{DynamicResource ThemeAccentBrush}" Grid.Column="1" Grid.Row="0"/>
-      <Border Background="{DynamicResource ThemeAccentBrush}" Grid.Column="0" Grid.Row="1"/>
-      <Border Background="{DynamicResource ThemeAccentBrush}" Grid.Column="2" Grid.Row="1"/>
-      <Border Background="{DynamicResource ThemeAccentBrush}" Grid.Column="1" Grid.Row="2"/>
+      <Border Background="{DynamicResource SystemAccentColor}" Grid.Column="1" Grid.Row="0"/>
+      <Border Background="{DynamicResource SystemAccentColor}" Grid.Column="0" Grid.Row="1"/>
+      <Border Background="{DynamicResource SystemAccentColor}" Grid.Column="2" Grid.Row="1"/>
+      <Border Background="{DynamicResource SystemAccentColor}" Grid.Column="1" Grid.Row="2"/>
 
       <LayoutTransformControl Name="layoutTransform" Grid.Column="1" Grid.Row="1">
         <LayoutTransformControl.LayoutTransform>
diff --git a/samples/ControlCatalog/Pages/ToolTipPage.xaml b/samples/ControlCatalog/Pages/ToolTipPage.xaml
index 73d83e08f1..ec073d48a9 100644
--- a/samples/ControlCatalog/Pages/ToolTipPage.xaml
+++ b/samples/ControlCatalog/Pages/ToolTipPage.xaml
@@ -12,7 +12,7 @@
               HorizontalAlignment="Center">
             <Border Grid.Column="0"
                     Grid.Row="1"
-                    Background="{DynamicResource ThemeAccentBrush}"
+                    Background="{DynamicResource SystemAccentColor}"
                     Margin="5"
                     Padding="50"
                     ToolTip.Tip="This is a ToolTip">
@@ -26,7 +26,7 @@
             <Border Name="Border"
                     Grid.Column="1"
                     Grid.Row="1"
-                    Background="{DynamicResource ThemeAccentBrush}"
+                    Background="{DynamicResource SystemAccentColor}"
                     Margin="5"
                     Padding="50"
                     ToolTip.Placement="Bottom">
diff --git a/samples/ControlCatalog/SideBar.xaml b/samples/ControlCatalog/SideBar.xaml
index 1ee6bf7a29..9b50a1d633 100644
--- a/samples/ControlCatalog/SideBar.xaml
+++ b/samples/ControlCatalog/SideBar.xaml
@@ -12,7 +12,7 @@
     <Style Selector="TabControl.sidebar">
         <Setter Property="TabStripPlacement" Value="Left"/>
         <Setter Property="Padding" Value="8 0 0 0"/>
-        <Setter Property="Background" Value="{DynamicResource ThemeAccentBrush}"/>
+        <Setter Property="Background" Value="{DynamicResource SystemAccentColor}"/>
         <Setter Property="Template">
             <ControlTemplate>
                 <Border 
@@ -80,6 +80,6 @@
         <Setter Property="Opacity" Value="1"/>
     </Style>
     <Style Selector="TabControl.sidebar > TabItem:selected">
-        <Setter Property="Background" Value="{DynamicResource ThemeAccentBrush2}"/>
+        <Setter Property="Background" Value="{DynamicResource SystemAccentColorLight1}"/>
     </Style>
 </Styles>
diff --git a/samples/RenderDemo/Pages/ClippingPage.xaml b/samples/RenderDemo/Pages/ClippingPage.xaml
index 8920b8a123..10225f7c49 100644
--- a/samples/RenderDemo/Pages/ClippingPage.xaml
+++ b/samples/RenderDemo/Pages/ClippingPage.xaml
@@ -43,7 +43,7 @@
                   C 72.078834 28.113269 74.047517 25.960974 74.931641 23.777344 
                   C 78.93827 14.586564 73.049722 2.8815081 63.248047 0.67382812
                   C 61.721916 0.22817968 60.165597 0.038541919 58.625 0.07421875 z ">
-      <Border Name="clipChild" Background="{DynamicResource ThemeAccentBrush}" Margin="4">
+      <Border Name="clipChild" Background="Red" Margin="4">
         <!-- Setting opacity puts the TextBox on a new layer -->
         <TextBox Text="Avalonia" Opacity="0.9" VerticalAlignment="Center"/>
         <Border.RenderTransform>
@@ -53,4 +53,4 @@
     </Border>
     <CheckBox Name="useMask" IsChecked="True" Grid.Row="1">Apply Geometry Clip</CheckBox>
   </Grid>
-</UserControl>
\ No newline at end of file
+</UserControl>
diff --git a/samples/RenderDemo/SideBar.xaml b/samples/RenderDemo/SideBar.xaml
index d6bde0b146..07fdb91a16 100644
--- a/samples/RenderDemo/SideBar.xaml
+++ b/samples/RenderDemo/SideBar.xaml
@@ -3,7 +3,7 @@
     <Style Selector="TabControl.sidebar">
         <Setter Property="TabStripPlacement" Value="Left"/>
         <Setter Property="Padding" Value="8 0 0 0"/>
-        <Setter Property="Background" Value="{DynamicResource ThemeAccentBrush}"/>
+        <Setter Property="Background" Value="{DynamicResource SystemAccentColor}"/>
         <Setter Property="Template">
             <ControlTemplate>
                 <Border 
@@ -60,6 +60,6 @@
         <Setter Property="Opacity" Value="1"/>
     </Style>
     <Style Selector="TabControl.sidebar > TabItem:selected /template/ ContentPresenter#PART_ContentPresenter">
-        <Setter Property="Background" Value="{DynamicResource ThemeAccentBrush2}"/>
+        <Setter Property="Background" Value="{DynamicResource SystemAccentColorLight1}"/>
     </Style>
 </Styles>
diff --git a/src/Avalonia.Controls.DataGrid/Themes/Default.xaml b/src/Avalonia.Controls.DataGrid/Themes/Default.xaml
index 17e7ecba43..738732f671 100644
--- a/src/Avalonia.Controls.DataGrid/Themes/Default.xaml
+++ b/src/Avalonia.Controls.DataGrid/Themes/Default.xaml
@@ -188,7 +188,7 @@
   </Style>
 
   <Style Selector="DataGrid">
-    <Setter Property="RowBackground" Value="{DynamicResource ThemeAccentBrush4}" />
+    <Setter Property="RowBackground" Value="{DynamicResource SystemAccentColorDark2}" />
     <Setter Property="AlternatingRowBackground" Value="#00FFFFFF" />
     <Setter Property="Background" Value="{DynamicResource ThemeBackgroundBrush}" />
     <Setter Property="HeadersVisibility" Value="Column" />
diff --git a/src/Avalonia.Themes.Fluent/CalendarDatePicker.xaml b/src/Avalonia.Themes.Fluent/CalendarDatePicker.xaml
index bc1aba1a03..ae9a63fc2a 100644
--- a/src/Avalonia.Themes.Fluent/CalendarDatePicker.xaml
+++ b/src/Avalonia.Themes.Fluent/CalendarDatePicker.xaml
@@ -53,7 +53,7 @@
                                Grid.RowSpan="1"
                                StrokeThickness="1"
                                Stroke="{DynamicResource ThemeBorderHighBrush}"
-                               Fill="{DynamicResource ThemeAccentBrush}">
+                               Fill="{DynamicResource SystemAccentColor}">
                     </Rectangle>
                     <TextBlock Margin="0,-1,0,0"
                                VerticalAlignment="Center"
@@ -80,7 +80,7 @@
             </Style>
 
             <Style Selector="Button.CalendarDropDown:pointerover /template/ Border#Background">
-              <Setter Property="Background" Value="{DynamicResource ThemeAccentBrush4}"/>
+              <Setter Property="Background" Value="{DynamicResource SystemAccentColorDark2}"/>
             </Style>
             
           </Grid.Styles>
diff --git a/src/Avalonia.Themes.Fluent/ContextMenu.xaml b/src/Avalonia.Themes.Fluent/ContextMenu.xaml
index 44783a8dea..33405ddc57 100644
--- a/src/Avalonia.Themes.Fluent/ContextMenu.xaml
+++ b/src/Avalonia.Themes.Fluent/ContextMenu.xaml
@@ -1,7 +1,7 @@
 <Style xmlns="https://github.com/avaloniaui"
        Selector="ContextMenu">
   <Design.PreviewWith>
-    <Border Background="{DynamicResource ThemeAccentBrush}"
+    <Border Background="{DynamicResource SystemAccentColor}"
             Margin="16"
             Padding="48"
             Width="400"
diff --git a/src/Avalonia.Themes.Fluent/TextBox.xaml b/src/Avalonia.Themes.Fluent/TextBox.xaml
index 2244f0b680..30d1039ece 100644
--- a/src/Avalonia.Themes.Fluent/TextBox.xaml
+++ b/src/Avalonia.Themes.Fluent/TextBox.xaml
@@ -49,7 +49,7 @@
             Margin="{TemplateBinding BorderThickness}">
             <DockPanel>
               <TextBlock Name="floatingWatermark"
-                         Foreground="{DynamicResource ThemeAccentBrush}"
+                         Foreground="{DynamicResource SystemAccentColor}"
                          FontSize="{DynamicResource FontSizeSmall}"
                          Text="{TemplateBinding Watermark}"
                          DockPanel.Dock="Top">