An interesting article on some sanitation workers in Hamburg who transformed garbage cans into pinhole cameras. The negatives are 108x80 cms in size and are well documented on the Flickr link within the article.
http://thenextweb.com/shareables/2012/05/29/these-garbagemen-turned-dumpsters-into-giant-pinhole-cameras-to-capture-the-city-they-see/
http://thenextweb.com/shareables/2012/05/29/these-garbagemen-turned-dumpsters-into-giant-pinhole-cameras-to-capture-the-city-they-see/