After watching Luke's vid on this I decided to do the same! I had an old i7 930 X58 machine in an NZXT Phantom (worst case ever) kicking around that my old roommate left behind. Photo dump of the whole process: http://imgur.com/a/HZoau
Not as flashy as some here, but I made it my own. I should also mention that I'm a quadriplegic and my hands don't work very well. Watching me use that angle grinder would have made veteran tool-users cringe. I did use gloves and safety goggles though!