Mandelbrot formula, inside mode is "0", outside is color decompostion, bailout is the default of 4, plane is 1/(mu-4.0115). Put all that together, press the random palette key (P) a few times and you'll get something pretty close to this. There is a nice 3D appearance to the color decompostion ribbons. Again, however, this coloring mode doesn't produce much variety so I don't try it out much.