Hey, new here...
For years I've realized that my Kensington Expert Mouse Pro has a somewhat transparent blue giant trackball, and while bored the other day I shined a flashlight into it, and it illuminated quite nicely. Today I opened it up and there's plenty of room inside for an LED or a series of them.
I'm probably going to mod the trackball out to illuminate the ball. I may look at adding a glow around the four main buttons.
Anyone modded one of these like this before? I'll have to steal current off of the USB, but a few LEDs shouldn't draw enough to cause undesired operation, right?