Making the snow is not very hard, all you have to do is reproduce what our elders did. During the shooting of the battle of Hoth in Empire strikes back, artists from ILM just used… some salt. A particular salt called bicarbonate of soda characterized by a finer strucrure than the sodium chloride (table salt). The only issue you may encounter is the gluing. The best way I found is to drop of some diluted white glue over the bicarbonate of soda using a big syringe.