If you're wondering what interests me about snow piles, or what snow means to me, even a part of what it means to me (because I don't go into the whole discourse on temperature, texture, light, smell, and sound) check out my post on a Grand Ave. snow pile and memories of Dottie over at Urban Sketchers—Twin Cities.
Don't let the lack of your regular sketching supplies become an excuse to walk by what caught your eye. Make it happen. If Dick hadn't been beside me with a pocketful of pens, I would have purchased one at the art supply store, or run into a restaurant and borrowed one from the cashier. Receipts make great scraps for sketching on—as long as they aren't those slimy photo-chemical coated ones (which you should stay away from anyway). Restaurant napkins of course are legendary as sketching fodder.