Here's a sharp looking papercraft pinhole camera you can download, cut, and build. It's a design that was published in a 1979 issue of "ABC mladých techniků a pÅ™ÃrodovÄ›dců" ("An ABC of Young Technicians and Natural Scientists") and translated for digital download by the Linatree photo printer and virtual gallery.
Link (Thanks, Peder Burgaard!)