PIXEL GRAFFITI WANTED!

Hello all,
I know I don't have a lot of information or pictures but I thought that I would pitch this idea anyway -
I am creating a game in RPG Maker XP that takes place in a modern setting, in a fictional city (modeled roughly after New York City). There are no battles, and no stats or EXP. It's a game solely about exploration and locating special items. Because the game lacks battles and leveling, I am trying my damnedest to make the exploration as in-depth and rewarding as possible. This means drawing a LOT of objects, people, locations, etc. The start location is the protagonist's tenement in a more run-down part of town.

Because graffiti and public art is such a huge part of New York City (or any populous area for that matter) I want to incorporate a lot of it into the game. I am capable of making some on my own, but I thought it might be nice to open it up to the RM community. What I am looking for is anything that is 96x64 pixels or less (If you make it in 32x32 increments that would be ideal). Make whatever you want, but keep in mind I'm obviously not going to be able to put everything in (for the sake of maintaining graphical standards and continuity). Basic tags and scribbles, up to elaborate more 'artistic' graffiti. Anything I put in-game may be modified slightly in color palette etc. to match the game color scheme. Also, anything I use will be credited to its respective artist in-game. If I left anything out let me know. Here are 3 very much in-progress screenshots of the game: