This video on adding snow, ice and sludge to your wargaming terrain. Useful stuff for the currently popular Frostgrave rules.
snow
Modeling Snow And Ice
Here’s a good photo tutorial on modeling snow and ice. The key ingredient is something called Snow-Tex, which is available at craft stores and works a bit like spackle.
Snow Terrain Tutorial
I like the way this modeler has done his snowy terrain.
Making Snow Bases Tutorial
The Mini Stories blog has a nice photo tutorial on making snow bases.