The Queen of Christmas was a recent advent book for us, and the girls both enjoyed it.
After Elliott read the book to them, they wrote their letters to Santa (with help). I printed the letters from Lily and Thistle which made the process fairly simple. Here's the link. O(5) has asked Santa to bring mini Marie-Grace and Cecile dolls, and she'd also like buttons (for her button collection) and Indian beads. E(2) would like a tiny pretend pig and a hankerchief (at one point, she was saying she wanted a "buh-loo (blue) hankerchief from Awaska (Alaska)." Thank goodness, she's no longer being so specific because that's just not do-able!