What is, really popular right now is chalk board wine glasses, so at parties you can keep track of your glass. However, some people are allergic to chalk and it can smear. Thus I propose dry-erase glasses, which is great the holiday parties coming up. First, tape off the bottom of the glass about ¼” to 1/2” up the steam. Then spray paint the bottom of the wine glass with white glossy paint. After it dries paint a coat of polyurethane on top of the white paint. You may need to paint more than one lay of white and the polyurethane paint. You will need to wait a whole day or two for the paint to dry or the marker ink will fuse with the paint.
Tips: make sure the paint can be used on glass.