When I went to the conference in DC, I had two ideas in mind for my Blueprints. The first was a river-bank clean-up. The Green Team at my former uni has one every semester; they're tons of fun and it's always exciting to see what people can find. Plus you're allowed to keep whatever you find, and there's a contest for the most interesting garbage. The first semester I participated, I found a roll of film and got it developed. I've also excavated a submerged couch, carried a living room back up a cliff, and rolled a 60-pound semi tire several hundred feet up a steep hill.