Hi,
the circuit is pretty simple. Just build a triangle oscillator (1/2 LM324) for each color channel. I stole the schematics for that anywhere on the net ;-)
Build three of them using different time constants (== Cs) for each channel.
The output transistor works as a current amplifier.
I wanted to have two changing lights, but was to lazy to build the circuit twice. So I put two leds with different color in series for each channel. This results in two rgb lights changing color with different "phase".
When i have time, i´ll translate that page of mine.
The other "project" - the name is just for fun. Is just the way i light my living room ;-)
DoS