I've always said that you can make just about anything with fractal noise and vector blur. This is especially true if, like I do, you want to make the gas giant Jupiter.
Io's texture uses two different scales of fractal noise, and polar coordinates to make a spherical map all within AE. Jupiter was made using nature's own fractal noise - a water ripple stock image, and of course vector blur. Gradient mapping is then used to quickly get a variety of jupitery hues at different brightness levels, with again some fractal noise bringing in some more organic variation by acting as a mask on another hue correction. Instant fully customisable and animatable Jupiter.
The lower image uses more aerial stock footage of clouds, with again some vector blur and similar colour correction techniques. The halo around the sun is due to octahedral ammonia ice crystals, which create totally different halos to those we see on earth caused by water ice. Special thanks to http://www.atoptics.co.uk for the halo info, I can't recommend them highly enough for all your atmospheric optics needs.
Edit: Writing today's post got me in the mood to have a go at another one, so here's a planet formation image I threw together in After Effects. Working on a documentary about this sort of thing would be fantastic.
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