I rather like this new map by Storm - it isn't over-ambitious, just a small snowy clearing with a few trees, and a very slippery frozen lake. Fall into the icy water and the shock will kill you very quickly, so be careful out there!
Two versions have been released, because the original version, with snow falling, caused problems online - so do without the extra prettiness and opt for the "Net Safe" version. I was tempted to rate this map at least half a point higher, but it is a bit small, and as far as I could see the cabin is just for show, you can't actually go inside to warm yourself by a fire. Still, it is well worth checking out, and deserves to appear on server rotas.