wow, that's neato-oh you mean, that's not your desktop pattern or a screen saver? Oh boy... I'd suggesting zapping your pram, maybe repairing permissions or resetting the PMU/SMC. to zap the PRAM, restart the computer, hold down the Apple, Option, P and R keys for 3 chimes, then let it go and let the computer boot normally. Info on how to reset the PMU/SMC should be found on Apple's support page. otherwise, could be a gpu problem. I hope you have Apple Care
http://www.apple.com/support/exchange_repair/
see here if there's an exchange/repair program that covers this
good luck to you
John B