The lights are up, the tree is decorated, the cookies are made, and the carols are playing. The only thing that will raise your cheer'o'meter at this point is a simmer pot on the stove sending out olfactory goodness to everyone that walks in your door. It is such a simple thing to pull off with very little investment and will set the mood of your house to warm and festive.
You will need:
Whole cinnamon sticks
Whole star anise (go easy on this because it can take over)
Whole clove buds
Whole nutmeg (grated)
Bring a pot of water to a simmer and add ingredients. Keep the heat low on the stove so it simmers the entire time you are entertaining.