I was just watching an interesting video by a lady who uses those flat clear glass marbles (like you would put in a glass vase) and makes little jewelry pendants out of them. The process is fairly simple, and the end result is beautiful. It is similar to those paperweights that you used to see that were made with acrylic and pictures underneath. What she does is coat the hollow side of the marble with clear (or glitter) fingernail polish, and then puts it over a picture or background that she has found in a magazine . She leaves it overnight for the polish to dry and then cuts around the edge of the marble to remove the rest of the picture. After that she paints the back (over the back side of the picture) and adds a clip so that you can thread the pendant on a necklace or bracelet. She said she sells these on ebay. I am not interested in making jewelry for myself (although maybe earrings ?) but it might be an interesting way to make a little extra money on ebay. It seems to me that this technique could be applied to other glass objects possibly; but that is something that would need more research. Here is the video.