Fun thing to do with $1,000,000:
Buy the rarest stamp in the world, the [[British Guiana 1c magenta]] (only one known to exist); last known value $935,000. If you can't get the owner to sell, you might have to settle for another rare stamp such as an [[Inverted Jenny]]. Anyway, get a rare, priceless small paper object. Then feed it to a goat. Take the goat's feces and mold it into a modern-art sculpture, and exhibit it at the [[Brooklyn Museum]].
And this will benefit Wikipedia... how?
Well, um... I guess you can release the sculpture and pictures of it under a free license to allow illustration of Wikipedia coverage of this project and any controversy you manage to stir up about it without resorting to fair use or anything else unfree.