This pendant is created from a piece of glass I got from a vintage flea market. It was one of several in an optician's box and I believe it is a lens from a phoro-optometer, which would have looked something like this.
The glass pieces are alll nicely curved and enlarge the picture placed behind it.
To make my pendant, I attached an image from Graphic 45 cardstock to the back of the glass with Glossy Accents. I added a silver bail and strung from chain I decorated with glass beads.