I all, I just bought a cool mice this afternoon, a small one called Genius NetScroll+ Mini Traveler. This one have Iris stuff inside. BTW there is a RGB led that glows inside and does random colors. As I'm at the point of soldering the Raibow Circuit, I just bought this mice to check out how they've done inside a so tiny box (and cause it looks awesome too ). I open the stuff and there I was really surprised. I thought I'd found a comme RGB Led with 4 pins and an IC controlling the thing. Instead of that, there is "only" a single LED with 2 pins. When you power this led with 3V DC, it randomly glows ! The circuit is inside the LED. I've been looking for such LEDs on the web without success this afternoon (well it was at work so I was not able to give my entire concentration to that search ). Anyway, I post some pictures to let you see the inside. If one of you have a piece of clue where to find this LED, i'll be very interesting in for a future mod.