Used an image based terrain generated in planetGenesis 1.7. I was experimenting with ideas for a planet texture when I hit on this weird swirly thing based on Perlin Turbulence. I multiplied together a large scale multifractal and a small scale multifractal, took the sine of that and fed the result into a Turbulence node to modify Biased Worley noise. This was the first stage in a very long slow-rendering graph that I had used to create a very convincing set of continents. Unfortunately the computer crashed before I could save the structure. I had a lot of trouble recreating it, but I thought I'd have a look at how this thing would look in 3d... Interesting... So here it is.