PARK(ing) - Guerilla Park Project

You've put your money in the meter, and you've got the spot for the next half hour. Now what do you do with it? If you're in San Francisco and part of the rebar group/project, you lay down some sod, put up a potted tree and some benches, and make a temporary mini-park. Or as they say: "Providing temporary public open space in a privatized part of town."

Very sweet idea. Originally via metafilter.