My absolute favorites are the intricate pop up books by Robert Sabuda: The Christmas Alphabet,
Night Before Christmas and 12 Days of Christmas. Cassie sent my son one when he was younger called
Red Ranger Came Calling by Berkeley Breathed. I also have two unique stories representing the Christmas story called
One Wintry Night by Ruth Bell Graham and
Mary's First Christmas by Walter Wangerin Jr.
I'll have to check back for more adult reading from you girls. :O)