As promised, here is a tutorial and all the images we found to use in our custom Disneyland autograph books! I did all the hard work for you (you're welcome!) and tracked down more than 70 characters, since you never know who you're going to see in the park.
I found this darling idea on Dara's Not in Jersey blog to make custom pages for each Disney character to sign, and then to organize them into a 4x6 photo album. Then when you get home, print a picture of your child meeting that character, and put it into the sleeve next to their signature page. It is such a cute idea and it not only saves you money on an autograph book, but it also makes a great souvenir that you and your kids will cherish as much as any souvenir you buy at the park.
Since it was my first trip to Disneyland, I didn't know which characters would be in the park so I printed out 2 copies of each page to make 2 autograph books, and it ended up costing me a ton in paper and printer ink. So in order to save you some dough, this is how I recommend you make your album...