One of the techniques we learned in Steven Forbes deSoule's workshop is glass application to clay. Steven made the platter above during our workshop. It looks much better in person, it was hard to photograph without proper lighting, it is so translucent.
Steven cuts the glass patterns with a glass cutter(wear your safety glasses) and places the pieces on top of the glazed ware. Glass rods are also cut in various sizes for use. The circles around the flower pattern are glass rods that were cut in very small pieces, as the clay melted it pushed out the glaze and made sort of a halo around the glass color.
When the piece is around 2000 degrees the kiln is opened and tongs are used to swirl the glass around. The results are sooooo wonderful!!