I've gotten tattoos to cover up scars, in celebration of recovery from SI. One of them is based off of a novel I've written, and the other is of a character whose aesthetic I love and whose story is brilliantly written, as well as a stark contrast to mine -- someone pointed out the juxtaposition of the destruction of the self (my scars) and the destruction of others (the character). It's pretty neat, and I really love using tattoos as rewards for things.