That would mean that your group will turn heads even if they're trying to lay low, right? That's pretty amusing. They'll be like a rock band. Hmm, what will happen when all these egos start to collide?
A variant of this (I'm remembering the movie Pillow Book) is the amount of artistry on the visible tattoos, where more elaborate tattoos would equal higher levels.
Could the tattoos shift position on the body?