Colors

CardGradient2Brush

<Border Width="400"
        Height="200"
        Background="{ThemeResource CardGradient2Brush}" />

CardGradient1Brush

<Border Width="400"
        Height="200"
        Background="{ThemeResource CardGradient1Brush}" />

GlassAcrylicBackground

<Border Width="400"
        Height="200"
        Background="{ThemeResource GlassAcrylicBackground}" />

GlassAcrylicBorderBrush

<Border Width="400"
        Height="200"
        Background="{ThemeResource GlassAcrylicBorderBrush}" />