We just happened to check out Soft House by Jane Yolen from the library last week. It's one of those books that fits so perfectly with an activity that we used it the very next day.
Since Firecracker had last Friday off from school because it was a teacher inservice day, it was the perfect day to read this book. Firecracker and Little Brother had been bickering...but once we got their own soft house (called a fort to us), they really did get along better! I'm sure it was mostly the novelty of the activity, but it was a nice break for me to have them play so well together.