You can also buy pre made blank books that will provide a different kind of experience for children.  There are several kinds available for purchase (if you shop around you can find some inexpensive types).  The ones below are perfectly fine – however, filling a book this big is a HUGE challenge for young children, so I wouldn’t expect it.  If you wanted to make a NUMBER book that children can work on over time, label each page with numbers and then allow children to work on them when they want until they are finished.