I'm taking a High School film photography course this year, and we had to do a research project and make a Pinhole camera. If you're not familiar with how they work, check out this article: en.wikipedia.org/wiki/Pinhole_camera
Photography and Lego, being two of my big hobbies, I knew I had to combine the two and make a lego pinhole camera. The design is mine, however when I was researching online, I discovered this Shutter Mechanism, and decided to use a modified version of it in my camera: www.foundphotography.com/2006/07/updated-35mm-lego-camera...
The camera breaks apart into the two pieces, and the light-sensitive photopaper goes in the back and is taped. The next picture shows examples of a few images I've captured with the camera.
I've done extensive work to make it light-tight, but it's really still all pure Lego. It's only electrical tape lining the inside where I've found that light gets in.