I have just started doing some vitrigraph. I took a stainless steel pan lid with the screw off lid, which left a hole about the size of a regular hole punch. I put a few pieces of colored glass over the hole and propped the lid on 2 inch kiln posts. As the glass melted (I have a kiln with the elements in the top, and the kiln had to be a little over 1500 degrees), the melted glass dripped through the hole and not only landed in a pile that spread out slowly, but with each new drip, it made a little ring similar to rings on a slice of tree bark. Looks very pretty! Caren