The Blackberry Pearl has colored LEDs beneath its trackball (except for models 8800 and Curve/8300) that can be manipulated with the right software. Here's how:
1.Using your Blackberry's browser go here here)
2.Select “OTA Install” under ColorPearl
3.ColorPearl will automatically install
4.Go to Settings/Options/ColorPearl
5.Choose your preferences
You can select from preset colors or define your own. Enjoy.