Four garbage collectors in Hamburg, Germany have converted large dumpsters into giant pinhole cameras to photograph their city. Dubbed the Trashcam Project, images were created by drilling a few tiny holes into the front of each trash bin and placing Ilford photo paper inside. The dumpsters are converted by drilling tiny holes into the front of the structure and then hanging large sheets of photo paper inside.
A trashcan, drill, some photo paper and a heck of a lot of ingenuity and you get this:
More photos here.
I've really got to give this pinhole camera thing a go...