Thankee-Sai's!
Mr. L: Probably, I've seen a post in here I think a while back where the entire terrain has been made into an infinite, repeating valley of peaks and troughs, but I'm yet to get my head around any of the fuction nodes. I'm no mathematician, just a humble-bum.

Inkydigit: Sonshine has a snowman model uploaded, it's a bit cold just now though for rolling it about out there today!

Calico: More than one snowflake population, set on different distribution terrains/seed/scale would help. I also think that opposing X-Z noise-stretches in blending power fractals for each population would make a nice swirly wind effect, if composed correctly.
Food for thought...
Cheers!