I have been using a modified version of the Asevo skin for some years now. I changed the color of the text for just about everything to make it more readable / user friendly. I have not had many issues changing colors except for the "alt text" color at the bottom of an image. I can't find where this is handled in any of the CSS files. Does anybody know?
Can't tell you but have you tried using the FireBug extension for firefox? It can tell you exactly what CSS applies to any element you click on. Extremely powerful ;)