Sometimes, the wonderful ideas we come up with don't fit in a traditional box. Same thing goes for scrapbooking.There are a few things you can do to get around some hard to fit items. For example, you have the neatest travel brochures from your vacation...how do you get them in the scrapbook without hiding part of them. You may have a beautiful graduation announcement or invitations that need a special way to attach them.
You can make your own vellum pockets to custom fit your souvenirs. You can also use CD holders or sheet protectors. The latter are just clear plastic or poly, and you can add color and embellishments to make them match your scrapbook pages.
There are actually page protectors that feature built in panels on both the right and left edge that close to meet in the center, like a shutter and also ones that just have a fold over on one side. These would be handy to use to perhaps put a travel brochure in.
There are lots of really neat patterns and ideas to use for these special holders. All you need is a little imagination after you see the idea and you can vary it however you like to fit your needs.