I'm thinking something like a turbulence node with displacement and transparency might do a swirling effect in more than one direction. 

This is giving me ideas.. I'll have to experiment L

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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.