Yes, you can use your digital bodies as pinhole cameras. Just take a cover, cut a 1/2 inch square hole, tape tinfoil to the inside, and make a clean pinhole in it and away you go (with your tripod, of course.)
Here is one I did this way (and converted to B/W):
Yeah, the thickness of the plastic would be problematic, but I am sure that you would be able to get an image, as long as the whole isn't too big to create large circles of confusion and make it all too blurry (which speaks to Justin's comment.)
LOL, the first comment to your post is Brandon: "I'd be down." But true, I guess I never said I would like to do something.
SO, Jason, Brandon, anyone else? Im going to head up to Brighton beach and try my hand at pin hole'ing. Ill be there at 1. After that, I think I would like to head down town someplace and set up on the sidewalk. I want to do something like Jason did in a busy hallway at school. So, anyone still want to go?
Yeah, but it was way to windy outside to keep my tripod steady. I even hung 20 pounds from it and it still would shake when the wind hit. So I think its a great day for indoor pinhole'ing! Lol. Maybe the mall?