People didn't come forward with as many ideas for Christmas books as I was expecting, but I'll share the few that I received or collected on my own.
At Silver Shoes & Rabbit Holes, Danzel recommended The Twenty-Four Days Before Christmas, part of the Austin Family series by Madeleine L'Engle. (I didn't even know that Madeleine L'Engle had written these!)
My good friend, Amy, recommended Christmas By the Book by Beverly King and also The Christ Commission by Og Mandino.
My other good friend, Amy, gave me The 13th Day of Christmas by Jason F. Wright. I read it on the drive to Colorado and enjoyed it.
Samantha @ The Musical Feast recommended Hans Brinker, or The Silver Skates by Mary Mapes Dodge. I think I read this one when I was younger, but I don't remember anything about it. It seems like it would be great for January, too. Samantha reviewed it recently and said it didn't quite meet her expectations.
And as for the other books I was planning to read, I loved The Mansion, Lost December, and A Dog Named Christmas. I gave up on The Christmas Train (there were parts I liked but there were a couple of red flags I was nervous about). And I sadly never got to Jacob T. Marley. Next year!