Make use of some of the resources on the tabs below (carols, reflections, scripture, literature, etc.)
Display Christmas cards on refrigerator or wall and take time to pray for families/individuals who sent you the cards.
Sing a few Christmas carols, or have a Christmas carol dance party (interestingly enough, the word "carol" in its original sense implies dancing).
Take a walk in a forest, by a river, or at the beach. Meditate on one of the Scriptures for the day.
Watch a classic film together and talk about it afterwards.
Trace the etymology of your own name. Don't just go to one of those sites where they list a bunch of names and put some vague, saccharine translation next to it, but really try to figure out what the cultural significance of your name was when it was first coined, when it was most popular, etc. What language does it derive from, and what parts of the name mean something in that language? Do the same with your last name--when did people bearing your last name first appear?
If you have any left, give one of the gifts you did not give on the first day of Christmas.
Make someone a new winter hat, scarf or coat out of old clothing you already have and decorate it.
NO CASH OPTION: Write a Christmas carol or poem about the person (take a cue from "Wassail, Wassail." Try to do better than mad-libbing "Rudolph the Red-Nosed Reindeer").