It's actually fairly easy to create gas giant cloud formations by stretching your cloud fractal along the planet's longitude. You can of course use multiple layers with different altitudes and colors, and even get some swirling patterns with the warping functions in the fractal. The results can be pretty good, although I was working on an Earth-sized planet and really it should have had a much larger atmosphere. It would be fun to see if you could actually pull off a Jupiter-sized planet with atmosphere all the way down.
- Oshyan