Not really a suggestion or request but I traced some graffiti from pictures in London, however I haven't made them into prints in case you wanted them as ModTer, or custom sized bricks, so feel free to crop certain ones out if you wanted to use them for a city build or whatever.
The image is a lot larger, I've just scaled this one down for preview, imgur link at the bottom.
https://imgur.com/a/3uW6x