If you're going to make a pinhole camera for taking pictures with, there are probably more practical cases for it than a 150-year-old human skull. But then again, it's tough to find a more unique camera than the Third Eye, which is indeed made out of an old skull.
It's a sculpture, technically, so it's not like you'll be seeing skull cameras popping up at Best Buy anytime soon, but it is a functioning camera. The skull formerly belonged to a 13-year-old girl, who now has a camera placed on her forehead. I'm sure the photo quality isn't all that great, but hey, you'll always be sure to capture some freaked out expressions on your subjects faces. And that's gotta count for something.