> I think about swirling dust clouds, wind and fire, wind and smoke etc.

I saw once a incredible work on cloud visualization on this web site, there
was a page of povray renderings of clouds, really impressive.
There are big (~200 Mb) animations too, but I haven't download any.

Old page:
http://research.orf.cx/ncommas/
New page:
http://research.orf.cx
A sample:
http://research.orf.cx/journal/archives/00000007.html

Probably you can contact the author for further informations.
Have a nice day,
;-)
Paolo

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