@MarkMcFear:
It would probably be best to use it in moderation...if we all had 5 GHz Pentium VI PCs you might be able to get away with everything
Perhaps a mixture of some objects that move via wind effects(to add the random touch) and models with looping animations would work best. Anyway, I'm still hammering away at it, so what is above will change a bit, most likely. Check back since I won't post a new reply..I'll just edit the code above.