Basic Twist and Pop

You can add this to your book creating more journaling or photo space.

Use card stock, scrapbook paper, or design your own unique painted or printed paper.
Make sure you have the correct weight to support your photos or embellishments.

Pop Up Basics

Shows four types of pop up styles, no template needed: beak, basic step, multiple steps, and tree.
Paper size should be cut down to fit on the inside your book with a margin of the two pages it lies on.  

There is also The Pop Up Channel that shows how to make more complicated pop ups.