You may want to configure colors in various XAML controls, e.g. in footprints:
<ColStyle Name="DS" Width="40">
<CellTemplate>
<StackPanel Orientation="Horizontal">
<l:CopyActionsIndicator
Value="{Binding Path=[archiveObject:Dests]}"
Foreground="Red"
Content="■"
Header="Copied to:" />
<l:CopyActionsIndicator
Value="{Binding Path=[archiveObject:Sources]}"
Foreground="#FF8cb2d6"
Content="■"
Header="Copied from:" />
</StackPanel>
</CellTemplate>
</ColStyle>
Colors as names
For the list of valid color names in XAML, see http://msdn.microsoft.com/en-us/library/system.windows.media.colors.aspx.
Colors as hex value
The first character is # that indicated that color string is in hex format
Next two characters in the color string indicate opacity: FF = 100% opacity, 50 = 50% opacity and so on.
The rest of the string is RGB value. See also http://en.wikipedia.org/wiki/RGBA_color_space.