Is that white, pearly, glow a little too boring on your BlackBerry Pearl? You can change the color, easily. 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. Hit the link below to get the very detailed instructions, including pictures. That's one good-looking Pearl.
Trackball Disassembly, LED Color Change & Reassembly [BlackBerry Forums]