If you use the oatmeal cannister, you might consider the idea of two usable film planes. You could have one pinhole on one end and a second one on the side with removable covers depending on which one you are using. By using the pinhole on the end, you'll get a normal looking image, but by using the pihole on the side, you'll get special effects, tends to look like a wide angle effect. Many years ago a co-worker of mine was experimenting with pinhole cameras using the film for a blueprint machine. It required very long exposures, but the film was developed by running it through the blueprint machine. Have fun.