We've had "Snowmen at Christmas" and "Snowmen at Night" for several years, but this year my 5 year old has particularly enjoyed them. The story is written in a fun-to-read rhyme, and tells of the fun snowmen have while you're asleep - and do they have fun! Singing, playing games, meeting Santa, eating iced sweets and more.
Each picture has a small mouse to look for, as well as 5 or 6 hidden pictures. I've been reading these books to my kids for years and I still don't think I've been able to find them all. This is my daughter's favorite part and I've seen her sit with one of these books for nearly an hour looking for the items hidden in the pictures.