Carl Zimmer is collecting examples of scientists with tattoos having a science theme. Got a tattoo? Send him a picture!
There is a weird comment about reluctance to show off these things if you don’t have tenure yet … I really don’t think skin art is one of the considerations in tenure decisions, though. At least it’s never come up in any of the reviews I’ve been involved in, although perhaps photos of artfully inked buttocks would enliven those often deadly dull tenure files.