I occasionally play with Houdini and with the release of Houdini 12.5 I had to play with it again. Check out the FXGuide article for some feature videos! I’m not sure yet why I would need clouds for one of my games, but it is amazingly fast to generate and render them! I might try my hand at some skyboxes or something like that with them. Since you can play with it for free I highly recommend going to sidefx.com and giving the apprentice version a try!
The below took me about 3 minutes to setup and maybe about the same amount to render. When I can sit down for a solid hour I hope to make something good!