I saw a nice-looking RGB system in Best Buy last week, and I just had to do it for myself. The case is a Cooler Master MB530P. Using the built-in controller for the three front fans and some daisy-chained fans for the two on the CPU cooler and rear exhaust. The graphics card syncs to the motherboard, so it and the cooler all cycle through solid colors together.
Call it a mid-life crisis, I guess.
Not a great photo. I need to clean up my desk and re-arrange stuff to make it really work.