I am going to try paper negatives soon - as soon as I finish the camera which will take the 5x7 holders I was recently given.

Trying a piece of 5x7 paper in the film holder, it appers that I just need to trim about 1/8" off of the short side.

I was going to do this with pinhole but I will very soon have a Symmar 210mm lens which should cover 5x7.