Truck Graffiti
In NYC, delivery trucks hold some of the best graffiti art and joyous images around! It's a movable feast for the eyes. Jim and Karla Murray have a fantastic set of shots called Van and Truck Graffiti NYC

Via the Gothamist's Beautiful, Lost Storefronts of New York

Street Art on Cars
Graffiti Truckin' NYC
Nightmare on Orchard Street

Photos via Jim and Karla Murray on Flickr. More info of their work in Burning New York.