(#7 of 25 for the 20/20 show) Wow. I just looked at this and realized I should have called in Yin Yang. Although it also has a look of a pool of lava. As I recall, I got the texture that you see on the right in the middle by spreading a thin layer of gesso, then laying some plastic wrap on it and peeling it off. Lots of transparent paint in the pools, and opaque paint on the ridges between them.