What I did for mine- was to take the small composition notebooks (they are the black/white marble looking books that have a sewn binding). I measured the front/backs of the books, cut decorative scrapbook paper that was in a coordinating disney theme, added ribbons and stickers and they're cute!
you can cover up the black "tape" looking stuff that covers the binding- but for mine- I chose not to. If I could figure out how to post a picture of one- I'd show it!
I've seen some for sale on ebay that are similar but they're easy to make and definitely inexpensive.