I use the cardboard from soda and beer boxes. They make a sturdy pattern that can be used over and over. Also helps keep the recycling going, less thrown away. They are also good for making large pieces when paper is too short.
I used to work with a nurse friend that used old X-rays as templates. Now that's recycling!
"Forget mistakes. Forget failure. Forget everythingexcept what you're going to do now, and do it."- Will Durant