He may be dead and decomposed, but that doesn't mean T-Rex isn't still capable of spewing the stink off you. Roman Mirskiy creates his T-Rex Skull Shower Heads on a 3D printer. They're all made from high-quality ABS plastic, or the same plastic as LEGOs. (Tip: don't leave the shower head lying around on the floor.)
The next time you're looking for a gift for a geek, ask him what size shower pipe he has in his bathroom. If it's a standard 1/2", you've got a winner, winner Cretaceous dinner with the T-Rex Skull. It comes in white, green, blue, black, red, and yellow.