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Get a warm sleeping bag, if it's really cold I sleep with an additional fleece liner and long underwear.
If it's realy snowy I just pack in a bit of firewod and keep a small fire. After sun goes down you won't want to be outside of the tent so I usually find i just cozy up in the tent after sunset.
One thing I can't stress enough is to not leave shit out overnight. Once left out a dehydrated meal bag and my gloves underneath my pack and awoke to the meal ripped apart by a raven and my gloves frozen solid.
Building snow structures; Igloos and Quinzees is pretty fun, always bring a snow shovel.
Will post a couple winter camping pics