I want some of these: tri-color LEDs. They're way-cool! Basically, they're a triad of a red, green, and blue LED in a single package. With the white diffuser, you can basically make any color of the RGB rainbow by applying the appropriate current through the three anodes. Someone at work bought a homemade piece of jewelery at a party last week and was showing it to me at work. A tri-color LED, a microswitch and battery, and a PIC. Very neat color effects.
I think it's time I set up a small electronics bench in my apartment.