Just found that nice article at gizmodo called “DIY: Change the Color of BlackBerry Pearl Trackball”
As a Pearl user – of course – I am interested in that!
All you need to do is take apart the Pearl trackball casing and color over the LEDs with a colored permanent marker of your liking.
Well, I am not sure to do this “modification” with my Pearl too. You know, it’s permanent and I will not be able to change it back.
Somehow it reminded me to the Black Pearl
The original article “Trackball Disassembly, LED Color Change & Reassembly” was written by BlackBerryForums member SanFrancisco and contains a lot of pictures as well as a detailed howto.