What should I use for snow on my layout? Also, what could I use for snowploughs?
Uh temporary? Use Snow rolls. http://collectiblebuildingsaccessoriesosdep.blogspot.com/2012/10/christmas-village-buffalo-snow-roll-15.html
Permanent? Use Woodland Scenics Snow.
Any other ideas? I want more of something I can sprinkle on the tracks, y'know?
Apart form some homemade things those are your best options.
For snow plows I know that Bachmann used to make rotary snow plows but snow me and you are in the same boat