Christmas place cards
I'm not really sure how creative this is but we are having a Winter/Christmas wedding later this year.
What I'm thinking about doing is having a Christmas tree in the room where we will be having our cocktail hour. I plan on getting clear bulb ornaments and using a nice stencil and white paint to put names and table numbers on the bulbs.
Our guests can then take their bulb and place it on the miniature tree on their table. So we'll end up with little decorated Christmas trees on each table for the centerpieces.