I LOVE paper piecing. (I even briefly taught a class a my LSS on it) Personally, I like to create my own designs from coloring books. If you can, purchase any and all the coloring books (the books- not the individual sheet packs because the books are cheaper) at the park. There are several styles. The coloring books from the parks have more park specific things that will be more relavent for your pages. For instance, there are several pictures of Disney characters riding different rides from the various parks. I did an awesome (sorry about the bragging) paper piecing of Mickey, Goofy, Pluto, and Donald on the Rockin Roller Coaster! I just love paper piecing. . .which might explain why it is taking me SOOOOO long to complete one of my two trips from last year.
Another word of advice, scan the picture into the computer. The print it onto the various colors of cardstock or other paper you want to use. Let the computer do the detailing work for you. This comes in especially handy when doing faces- especially the small princess faces. The detail is there, so you make your paper piecing looks exactly like who it is supposed to look like!
Good Luck and have fun!
Kristin =)