Adorable! This project could easily be moderated to fit the recipient as a gift; i.e., '### days of summer' or '### days on our honeymoon', and you could add little photo corners to put in pictures or movie ticket stubs or whatever. Thanks for sharing!
Our local Habitat for Humanity Re-Store has a monthly book sale - $2.00 per bag, they are regular plastic grocery bags, but I can easily fit about 10 books in them. Cheaper than Goodwill or even garage sales, where books are at least 25 cents each!