When teaching older kids (about 11 yrs old thru high school) I first had the kids make pin hole cameras out of old 250 sheet boxes of 8x10 photopaper. We used 8x10 litho film, and then we made cyanotypes from those negatives. A lot of fun!

Freestyle once sold squares of cloth be soaked in the cyanotype chemicals -- I had the students print their pinholes onto those and we strung them on a line -- sort of like Buddhist prayer flags.