I have no clue where I am remembering this from --- but it seems to me --- that someone used Borax (washing detergent) for snow in a play once???? I don't know if this would work if you had to have constant snow --- and I don't know how the stuff actually looks, but it is buried in my brain somewhere as trivia that someone I know used it (I think)--- so maybe you could think along those lines? (Good news is --- mopping would get it up when you were through!) :-)

I concur with the potato flakes -- looks nice. Of course you could use the Borax as long as you don't have children or small animals anywhere in site -- but Borax does work well on getting rid of roaches (some of us who have had to renovate theater can share the horror). Borax is poisonous if eaten -- much like any other detergent/bleach.

See if you can find a local manufacturer of cigarette papers. They have machines that cut off the corners of the cigarette papers and these little triangles are waste material for them.You can get them for free, by the sackload, and they make the best snowflakes when released from a snowbag from overhead.