I was thinking about the great wave, a dragon, a dragon fly or something else made up of PCB layout lines. I think that would look very nice on a forearm. http://www.imakethings.com/2007/09/14/image-to-pcb-app-and-p...
Most science tattoos are very, very ugly. And what if maxwell's equations or the Y-combinator get invalidated in the future :-P ?