"Another thing that you could try (if you're willing to brave the render time) would be using heavy atmosphere with clouds and noise nodes, and then animating the clouds and noise." Heh, I'm a coward when it comes to render time. I use Poser for animations, so I need the best quality with the fastest results. I'll try these methods to see which looks and works best, and I'll have to take a look at that Particles program. It's nice to see Poser finally moving up the ranks and working with atmosphere & particle fx (as you can see I've been a P4 user).