Here's the plot. They print some instructions on a camera and give it to a stranger. The instructions says to take a few pictures and then pass the camera on to another stranger who will do the same. When the reel is out, you drop the camera in a mailbox and it will return to the original owner who develops the film.
The site only has one collection so far that they call Emily and the pictures aren't very fantastic but the concept is.
At the last reunion party for my old school, Grennaskolan, they put disposable cameras on the dinner tables asking people to take random pictures during the evening. Very results because on the tables there was not only cameras. There were glasses filled with stuff that makes people take pictures they might regret the day after.