Make a digital pinhole camera for free?
Make Magazine's blog post headline "$0 digital pinhole camera" sounded too good to be true, and guess what? It is! Poster Jason Striegel acknowledges that he "stretched the $0 part a bit" but even setting aside the fact that you need an actual dSLR camera for the project (which costs actual money last time I looked), unless you plan to beg, borrow, or steal the black construction paper, aluminum foil, rubber band, and tape you'd need, that will cost more than $0 as well. Still, the idea is an interesting one for photography buffs.