My SIL put photos of my nephew in a bunch of them, maybe 100 or so, and then hung them on the wall. They look pretty cool hung like that.
You could also put your own photos, of family or landscapes or other artistic photos in them and do something similar.
Something one of my friends did, only with regular frames but you could put these in the DVD cases, is that she color xeroxed vintage fabric scraps and framed them. Very pretty.