Church services and family worship time at home, and having Christmas decorations (and even some food) which point to Jesus.
Hosting in-laws for a week, and welcoming in various people who would otherwise be on their own, for meals.
Giving Christmas packages for children living in poverty.
Litter picking before Christmas to help the estate we live on and the adjoining countryside be pleasant. (Former council estate, not a stately home estate!)
Writing Christmas cards which include an appreciation of how the person has been a blessing to us, or things about them we're thankful for.
The children will make little Christmas decorations for ballet/swimming/etc teachers and some elderly folk in care homes.
My church will be offering free hot chocolate (I think! Something nice anyway) and I think free bibles at the town's Christmas festival.
I'm a SAHM and am offering some day-long playmates for my children's friends who are at school, to help their parents with childcare in the holidays.
I can't think what else, but will follow the thread for ideas!