Awesome shots! I suppose if you have 24/7 snow for months it must get boring, but we get mostly just rain here in Scotland so I would gladly trade you some of that for your snow! :D
I don't particularly have a favourite prop as I don't really use props in my photos but if I did It would probably be a transparent pvc tube with a flashlight in one end to do cool light painting stuff or a brightly coloured umbrella ..
Light painting is fun. I want to get one of these - http://www.thepixelstick.com/