Today I discovered a place describing this method to generate some beautiful (though kind of random) pictures. Some serious danger for your camera is involved … but some pictures are indeed worth it.
One of my favorites is this http://www.flickr.com/photos/mihaitza/392479098/, but many more can be found in the links below, e.g. at http://cameratoss.blogspot.com/2007/02/clickykbds-picks-issue-24.html.

Links: The cameratoss.blogspot with a mini-howto