This paper outlines the method that pretty much everyone used to simulate snow before Frozen. It would allow us to easily get footprints and simple packing motions. It doesn't look incredible, but it gets the job done. And it's pretty fast and cheap.
And then, of course, there's the paper about the snow from Frozen. It's a completely new method that's very complicated and time intensive. But it looks amazing.
And here's a really random bit of reference from the internet. Frozen bubbles! How cool is that?