Free Christmas Backgrounds For Photos & Cards?

Does anyone know where I can download free Christmas background for photos and cards? My mom is sending these cute Christmas cards to all the family.
She does it every year. I had the idea to add a picture of us in the card and we're going to also add a nice Christmas background so it looks better.
Where can I get the Christmas backgrounds them for free? I tried a few sites but you have to pay.

This is what I do when I want to find a specific picture of background for Christmas.
I visit Google images.
Search up the desired topic, in this case, Christmas backgrounds.

On the left hand side of the page, you'll notice it says: any size, large, medium, icon.

Select Medium or Large because you want something that fits your card size. Many of the images are too small and if you change the size and make it bigger, it will pixelate and look bad.

Go through the literally millions of images and choose what you want.
With so many pictures, I'm sure you'll find the right background.