In respect to a thread that Azchip and I have been talking about and other previous comments, I have some images here to upload which show one possible and cool funcion of the particle generator in C. After some thinking, I think it would be possible to duplicate a particle generator with starting and end times that mate up. Then a repeating loop for a snow storm could very easily be achieved if it used the same seed. You'd just have to be a little smart to get your filming times correct. This is only one small example of what the particle generator can do. It can be very very powerful. I've had very good luck with smoke.

-Kix