Billboard Liberation

My flatmates and I are trying to work out a creative way to modify a sign which has appeared around various local train platforms. It says: Graffiti costs an arm and a leg. The trick being to change it into a pro-graffiti slogan with a few deft textastrokes and some whiteout. The best I've been able to come up with is: Graffiti boasts an army. Given the overwhelming creativity of all those who read this, I'm sure you can all do better, so let's hear it…