http://cg.tutsplus.com/tutorials/autodesk-3d-studio-max/making-realistic-snow-in-3ds-max-without-plugins/

Ever wanted to create realistic snow in 3ds max without having to pay for an expensive third party plugin? Well you’re in luck, Chandan Kumar is back with another exciting tutorial where he’ll show you just how easy it can be to create believable snow using only Max’s proprietary toolset!