Super Nintendo cartridge wallet: you probably want this

Sure, it might be a little more cumbersome than your current billfold -- but whatever -- this is awesome. This SNES cartridge has been modded so that it holds a photo ID on the front plate, but it's also been gutted of its internals and outfitted with a hinge so that there's storage space on the inside. Oh, and it's got an LED that can be powered on and off, plus it plays game music / noises! Crazy, right? Well, it's slightly complicated to build one of your own, but Instructables has the details, should you want to give it a whirl. Ask yourself this: what better way is there to spend New Year's Day?