The Gessi ceiling-mounted faucet is mounted to the ceiling because walls are boring. You control the flow with a little joystick (or optional remote) and they probably cost a fortune. Especially if you don't already have water pipes running in your ceiling. Still, I like them and wouldn't be upset if one of my favorite bars installed them. But I would be if my girlfriend tried to in our bathroom. Last week she was installing a new shower curtain and, long story short, almost burnt the house down.
Gessi's Crazy, Crazy Ceiling Mounted Plumbing [uberreview]