The folks at Apartment Therapy have put together a nice compilation of Christmastime decorating ideas that are simple as it is beautiful. For example, this:
from here. And this
What all the images have in common is the use of natural decoration, from boughs to wood to wreaths to baskets to lanterns. It’s seasonal, but timeless.
If you find it too austere, mix in some holly or some ribbon.
Enjoy the season, and the beauty of this time.