I know that but before version 2008, 2009 or 2010, the visual appearance of the layer button didn't have any "gradient color" inside and it was more easy to see the difference , when you have more than 30 layers on the top and you always scroll in it, the small color rectangle or triangle is not the best thing, the color attribute should affect the whole button and be fade when it's not visible. Maybe for the next version..