Patty Paper Proofs

I have been using patty paper in my geometry class to help students understand concepts. It has been a huge help especially with students who have a hard time visualizing. I usually have an easy time knowing when to pull out the patty paper in geometry but not so much in pre-algebra. I am sure this method could be helpful in pre-algebra as well in areas other than geometry. I would appreciate any ideas. I also really like using foldables for note taking. They are a great place to store the patty paper.