Scan your ticket stubs, airline tickets, maps and menus from your trip and lay them out like a collage. A great way to remember details you would otherwise forget. I always throw a bunch of paper ephemera in my luggage so I have some fun stuff to add to my photo books.
Family yearbooks. Why didn't I think of that?? Since most people don't print out pictures like they used to, this would be a great way to document your years in pictures and still have hard-copies to look through/show people.