I have demonstrated the Secret Weapon Miniatures crushed glass technique a number of times, and it is one that always fascinates me. Unlike most other snow materials, this is extremely sturdy once it is in place, and it also allows you to do a wide variety of textures.
Depending on your ratio of water effects to crushed glass, you can have a snow that is quite melted to something more fluffy and white.
I have used this on my vehicles as well, which is very handy, as snow will melt in areas that have heat, such as exhaust fans, etc.
I have also combined it with other materials, as I did in this live session: