one of my training buddies has a symbol of every oart he's trained in tatted on his body somewhere. I am planning to get one - a big one - across my back, but it'll be expensive, and likely painful. I talked about it on a thread a few months back, but it will be a capoeirista fighting a thai boxer in a roda of fire. (I train thai boxing, my kid does capoeira and I do classes with him) In the background a judoka and a kung fu guy will be watching the match, representing two other styles I've trained in. I considered putting a karate guy in the background as well, but it will be hard to tell him from the judoka, as would a bjj guy.
I talked to a guy about it and he really wants to do it. either that or he wants to do one of goku fighting majin buu (he knows I'm an anime fan)