A group of binmen from Hamburg are currently taking part in a photography project. They have converted large 'dumpster' bins into pinhole cameras, by drilling a small hole in one side of the bin and hanging a large piece of photo paper inside opposite the hole. It takes about an hour to project the image onto the paper. They then develop the photo in their specially made lab. Presumably they have to seal down the lid whilst the photo is being developed to prevent people opening the bin and depositing rubbish. See more examples of their work here.