Well, all I did was put a little arrangement on my coffee table. But let me give you some examples of what my mother does. She goes all out, even though it's just her and Dad in the house. She's a holiday nut.
Outside: lights all over the house and shrubs. An older artificial tree with lights on the porch, along with a plastic snowman in the yard and some other sort of arrangement on her flower cart. I can't remember what all she put on it. She also hangs wreaths on either side of the garage, and the front window of the house.
Inside:
Living room: A big tree, of course. Greenery and candles in the window sills and draped over doorways, etc. (Most of her greenery is artificial). Christmas slipcovers on all the pillows on the couch. A couple of tabletop nativity scenes and wind-up music thingies on the coffee and end tables. A snowman hanging on the wall, or sometimes she drapes it over the back of the couch. She hangs Christmas cards around a doorway as she gets them.
Kitchen - holiday placemats on the bar and table. Christmas dishes used at every meal. Christmas cookie cannisters, hand towels and dish cloths.
Bathroom - Christmas hand towels
Windows - those plastic sticky things, .... oh, you know, you can stick them on the windows and make little Christmas scenes with them - snowflakes, trees, Santa and his reindeer... lots of fun when we were kids!
I strongly suspect I'm missing a few things, but you get the idea.
