Titan

Titan, Saturn's largest moon, is a world wrapped in thick organo-nitrogen smog which conceals the surface in visible light. Infrared and Radar mapping revealed a world of tar-soaked dunes, great plains of ice, and rivers of methane and ethane that drain into vast polar seas. Here, we can see rare storm clouds gathering over the north pole, as a methane "monsoon season" gets set to begin.

All the atmospheric effects, from the clouds to the detached haze layers were all done just by simply layering different volumetric materials together. The final result looks quite authentic when compared to images returned from Cassini.