Image by Getty Images via @daylifeSnow Storm is a decent simulation of snow storm with snow blowing by your screen in unfocused blobs of gray and white. I was wishing for a bit more customization of amount of snow and/or wind speed and direction though.
Rating: Try it, when it's winter
http://www.appbrain.com/app/snow-storm-live-wallpaper/com.atplatforms.wallpapers