The library in our town used to allow us to make copies for free - up to 10 copies a day for free. We lived across from the library for six years. I would drop photos into a Word Doc, then print them at the library. Dropping them into a Word doc allowed me to re-size and crop the photos. The copier at the library only made black and white prints, but that was OK with me; I like B&W photography.
After I found some metal picture frames at a yard sale, I tried to find a way to display photos so that I could change them out willy-nilly when I tired of a set of photos.
I painted some 1x2 boards and we arranged them on the wall so that we could trap the picture frames between the boards. This worked really well . . . . except that the frames were hard to get in and out of their positions between the boards. The interchangeable aspect of this display became a moot point, though, when we opted to put a pass-through in this wall; I never did get the opportunity to change out the initial set of photos! I would definitely try something like this again. It is an effective way to display photos. But if I tried this again, I would find an easier way to attach the photos to the wall. I'm just sayin' . . . .
For newer versions of photo displays, click on the link below.