Creative Memories has a nice 7" X 7" scrapbook album that can be used as an autograph book. Since it's a little bit bigger than a traditional autograph book you can add other items such as photos, your used tickets, and other momentos. I have one for my 5.5 DD that I used in April and it worked out great. I opened the book to the page that I wanted the character to sign and left room for the pictures I took of her with that character. It was more than just an autograph book.
HTH