That's a white LED under the buttons. I guess you could take it apart and color the back of the buttons to simulate a different color, but I think that's probably the only way short of changing out the actual LEDs.
I agree, how did you do that? I have been coding for Android for a few years, but I can't seem to figure out how to do this on my Droid. Its really easy on BlackBerry (work phone). Don't be selfish, come on, help us out!
Okay, to be fair, I'm completely new to the droid...
But if (as i suspect) there is a single LED, (or a few single color LED's) behind those buttons, the only way to change it would be to color the filter (paint/dye), or swap out the LED's...