@Gidde: Closures are pretty rare, yeah. But while we're colder than Michigan temperature wise, I think the Michigan/Minnesota area gets some pretty big snow falls, especially the UP region. (Not to derail the thread!)

I think everything here is a pretty good, clean, representation of a snowy field and road. My only wish with a map like this would be a little elevation difference between the road and the snow, either higher or lower. A higher road would be more dry and less muddy, a low road would be a boggy cesspit. One way to get a quick elevation or slope is to use adjustment layers in Photoshop, especially the Expose tool, to lightly paint regions of shadow where you want them.