GraffWriter™ online studio uses graffiti style alphabets, images, effects & concepts from the official Graffiti Fonts® collection to allow users to create customized artwork for any purpose.
They also supply some great graffiti fonts for use within their site, you can also buy fonts from http://www.graffitifonts.net/. The graffiti generator is free for personal use, I’ve had a quick play and I think that it’s fun and easy to use.


You might also like to check this out:
Murder Death – Graffiti Creator
Stainer1’s – Graffiti Supplies