I made a pinhole camera out of $1 worth of foam-core and spraypaint, and a diet coke can. It takes 8x10 paper negatives, although it could probably be modified to take sheet film. I just got the exposure roughed-in today (about 15 seconds in daylight). The contrast is a bit off but I can't believe how sharp it is for having no lens. I would post pics but they are still in the analog domain.
Ever make a pinhole camera? Post pictures.