I'm part of a book exchange project with some of the members of Handmade Philly. We started in April and once a month we mail a book to each other. Each of us add something to the new book we received, then at the end of the month, we ship it off to the next person. After 8 months, we will have our original book back. My book was just a tiny moleskine, but some people were more creative than that.