Back to the Future fan art, courtesy of (read: stolen from) a young lady's Biff Tannen fansite (!): The Biff Tannen Museum!
I like this fantasy poster because it A) spells Spielberg's name wrong, and B) includes Biff because she's a hardcore Tannen fan, but she also realizes the poster can't be too Biff-centric, so he's just kind of hanging out on the perimeter.
A lot of people will probably be asking "where can I get those jackets Biff, Doc and Marty are wearing?" Answer: the future.