Replace one of the standard TextWindow colours. There are 16 available colours, by default they are indexed 0 to 15: Black (0), DarkBlue (1), DarkGreen (2), DarkCyan (3), DarkRed (4), DarkMagenta (5), DarkYellow (6), Gray (7), DarkGray (8), Blue (9), Green (10), Cyan (11), Red (12), Magenta (13), Yellow (14), White (15). Note that you can still use TextWindow.BackgroundColor and TextWindow.ForegroundColor to use the new colours (with the original colour names), alternatively the colours can be selected using LDTextWindow.SetColours from the indices. The colours must be set using either method before they are applied.