I can graffiti decently, heres some stuff ive done:
http://www.deviantart.com/view/16358592/
http://www.deviantart.com/view/18034978/

Is it your daily driver cause I don't know if I could do it in one day. You could porbably get it done for free if you spray TAG ME on it and leave it by someplace thats been tagged up, just remember to tape off the windows