Our tree has 3 sets of lights on it. A load of tinsel and loads of glittery ornaments, and quite a few different, more muted nature-y type ones too.
I have various tealight holders on the mantelpiece, and an aromatherapy burner too, and often have up to 6 candles dancing on the mantelpiece over the roaring wood fire in the stove. And we have a fleece blanket which has a Santa in his sleigh scene, which comes out for December as well, on 1 armchair.
We used to put up glittery garlands, but not always.
There is a wooden crib scene carved from 2 different tree trunks that fits together (2 different shades of wood, I presume the bits not used in our set made an opposite crib for someone else) - that goes on the drinks cabinet. I also have a snowglobe up there.
We have a larger crib that we sometimes put in the hall - but it takes up the whole table so DMIL borrowed it last year.
DD has a hanging santa twirler on the stairs up to the attic, and a few snowglobes and stuff up there too. We sometimes put snowflake stickers on her windows as well. And she has a Santa duvet cover set on her bed which she loves.
In the kitchen, I have some more candles, and some of DD's artwork stuck to the fridge and windows. I usually have fresh flowers of some description in here too. I also have a Christmas apron, and Christmas teatowels and hand towels, which are on display (and used!). A few Christmas mugs gathered over the years (totally mismatched and kitsh-y, but I love them!) get used frequently. And I change the placemats from regular blue ones to gold mats in the middle and big red charger mats at each place.