I've used plain old modge podge, and then coated the photos in several coats of a clear, satin, polyurethane that you can get at a hardware store. Only trick is, my photos ran a bit, so I have to figure out what to spray them with first so they don't run.
Me too. I've been printing collage sheets on an inkjet, but depending on the image, the red seems to run just a little when I put modge podge over it (especially to make scary red eyed children). I've heard an artist's workable fixative might help. Any thoughts?