hi kimoni

they kind of said what i was thinking of
having fun with 35mm film is fun and it is fun to enlarge
something small and make it big ( and the destruction big too )
but if you make a pinhole camera out of any sort of box ..
make it black inside and make a tiny aperture out of thin metal stock
http://www.google.com/search?client=...UTF-8&oe=UTF-8
so the negative you start out with ( film or paper ) won't be so small you might have an easier time
destroying / experimenting / manipulating specific areas of your negative.
you can also manipulate it / destroy it while you are processing it
and with the red light you can see exactly what is going on ...
if you specifically want FILM, you can get xray film, it is slow like paper
and each sheet cost pennies instead of dollars.

have fun !
john