I use all sorts of junk to make images and I spend lots of time with cadged together lens boards and improvised shutters playing with lenses that have no right to be on a camera. One of my favorite is the objective lens from a set of binoculars. Right now I'lm playing with a series of projection lenses from the first half of the 20th century, but magnifying glasses, condenser lenses, viewfinders from cheap TLR's... just about anything that will resolve an image gets a try out. I have bags of the things and keep buying/trading/finding more. It's just plain fun.