I don't think you should have a t-shirt. Usually when we have graffiti parties you simply bring a blank white shirt, and that's your souvenier (although I would never wear any of my graffiti shirts out in public).
If your creating a t-shirt that people will get after the party, then perhaps something like a brick wall with "spray painted" writing of the details of the party (whatever you normally throw on there - date, chapters, university, party name).
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