Hi there David - I used good old fashioned plain flour - about 4 cups in cooking terms.
I sprinkled around the base and placed figures accordingly.
Originally I wanted to create a snow fall scene by using chalk on a duster and sprinklering over the scene then take a picture, but it would have been a of a 'oncer' if it didnt go right, so I didnt carry out. I couldnt get the camera filter to give the flour that snow sparkle affect otherwise the texture seemed abut right.
Have you used any thing different to make up snow ???? I would be interested to know.