At Garden ridge pottery - It's a "floating frame" whereby one sheet of glass is surrounded by a wooded frame that has some depth to it, a second sheet of glass has a similar wooden frame that fits inside the bigger wooden frame. The idea is that you could place a picture in between the two panes of glass and it would "float" with the transparent glass as a sort of mat,

It appeared that some woodscrews in the outer wooden frame with some washers from the hardware store would compress the inner frame, and therefore the two panes of glass, together, making a pretty good contact print frame. $13 for a 11X14, I think $20 for a 14x17. I almost bought one, but I didn't want to be seen purchasing something from Garden ridge. That and gear acquisition syndrome has me contemplating the purchase of a larger camera, so I wasn't sure what size I wanted.