Disclaimer: I'm not into tattoos in general. O.o My background makes the idea of 'branding' myself inconceivable. However, I do find the art and the choices of subject matter for tattoos (on OTHER people) very interesting. And I do love it when someone shows off a particularly nifty bit of skin art. ^____^ This is a collection of science-related body art.
http://www.flickr.com/photos/carlzimmer/sets/72157601351535771/
http://www.flickr.com/photos/carlzimmer/sets/72157601351535771/