The graffiti at my high school consists of "SUR" and "NORTE" (South and North, what creative gangs we have), usually written in Sharpie on locker room doors (what scenic territory to mark). Disembodied male genitalia is also a common subject. Very rarely is anything spray painted on school walls, and when it is it's just as plain as the Sharpie. No fancy design or color.
I'll add a big S in front of "Norte" if no one gangly is around. I've never had the chance to edit a "Sur," but if I do I may add "fboard" or "gery" to the end. And once I saw everyone's favorite word written on a wall in the wood shop last year, but the fool forgot the C. I turned the K into an R, and wrote a finisher to the message underneath. It then read:
FUR
Cats have it.
Am I just as bad as the original vandals? Or am I making light out of filth? You decide.