you could make a spray can with graffiti style writing on it. or make a fondant person graffiting a message on a building. find out his favorite group or person and use the graffiti style of writing on the building or on a record. if that makes since? google graffiti and then click on the images button you can get lots of ideas for that style of writing or combine both keywords and see what you get.
maybe utilize those spray cans of food coloring for a graffiti effect as well, or airbrush if you have one.
I had the same idea as Amanda80; a brick wall background with "spray painted" message in a grafitti style font. Sounds fun!
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