3D printed iPhone cases with working gears:
Does it come in schyber sschilver?
This is pretty awesome as a concept, but I don't think people use cases and phones the same way I do. Those gears would crumble apart in under a day in my pocket.
This would be infinitely cooler if one of those gears had a fold out crank, and they all hooked up to a little dyno that could charge your phone.