This is a lot of fun and a great way to pass the time as you anticipate your trip. I made one by downloading Disney clip art and printing on card stock. Then I organized the pages and had them bound at Kinkos -- this was really nice as they also included a front and back cover, so it looked very finished and I was able to include a bunch of pages.
You can get a lot of grea ideas at the Creative DISign board --- there are a lot of generous people that will give you access to their templates and ideas. There is also a great "sticky" page by Baloo that includes a lot of super Disney clipart sites. Be careful, you also may embark on some personalized t-shirt transfer projects too!!!
There are also great ideas for just having scrapbook pages autographed so you can scrap w/pics when you return. Also pillowcases, quilt squares, picture mats and plain white bucket hats are some ideas for autographs as well.