Go to Walmart and Buy Two Twin White Sheets at 5 Bucks a piece.
Go out early and set up. Use your decoy bags as bedding and make your self a snow blind. Cut up one of the sheets and make a hole in the middle with arm holes. Cut off some excess and make a face wrap. (If you have snow Camo then you may only need one sheet to hide your outline).
When you hunt like this, the most important thing is to not move until you are ready to shoot.
My set up from last year http://i.imgur.com/yj4ws.jpg
Another View http://i.imgur.com/HzKny.jpg
Last year we didn't have snow, so I stomped my muddy boots on the sheets to blend in with the ice.