Really? Can it be? We can make cameras out of paper that work?
Find the above camera (and others) at the Corbis Readymech website. Each camera can be downloaded as a free pdf pattern that you print on to "several sheets of good printer paper" and then put together using an illustrated instruction guide of only 14 steps.
(The happy film canisters above are just part of the instruction guide that I especially liked.)
Above is a dreamy example of an actual picture taken with the World Pinhole Camera Day Camera, courtesy of the Corbis photo gallery.