System Color chart available?

Is a chart availble with the details of what each color item is refering to?

When I want to change System colors, it is not obvious what item to change. For example: by trial and error I discovered that Color 8 might be the active titlebar charactors. Or that Color 12 might be the clock in the Sytem Tray. Instead of altering them one at a time and then seeing what changes appear I would like a detailed chart pointing to the window items with their color tag.