I found the stuff at a Craft store in Oregon called Michael's Crafts...worked pretty sweet, but very expensive due to the 3 coat process...start with black undercoat (essential, be thorough), then the two-tone color (almost clear, but shiny), then the clear coat (really clear, but the important final touch).
The stuff is about $20 per 3 can set, and it took 3 sets to do my tower interior and drive bays. Pretty expensive, but I should have done the outside of my case too.
It is a Krylon product, so go here
Krylon Mystique webpage to read about it...there may be other brands, but this is what I used.
Turned out great, I can post pics later this week.