From scratch or just different blends of ingredients (especially alcohol) to add to store bought Egg Nog, etc. I like Turkey Hill and the two Southern Comfort kinds you can get in the store... btw.
Bacardi Special Dark or Black Seal rum. 1/2 and 1/2 with the 'nog. It'll warm you up! I'm also a fan of getting some fresh apple cider (might be hard this late) and warming it up on the stovetop with a fifth of spiced rum, a couple oranage halves and a couple cimminmon sticks. Same result as above.
[ame="http://www.youtube.com/watch?v=cym7kZSeouI"]YouTube - Making Eggnog With George Washington's Recipe[/ame]