Remember it's also possible to apply a "mask/gel" to the fog. I usually plug a turbulence into it, gives a sort of swirly fog :)

An example is on this promo pic where I also used a brownish fog colour http://www.renderosity.com/mod/bcs/index.php?ViewProduct=75257&vendor=83499

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.