Greetings from New Hampshire.
Marti Michel has wonderful sets of templates that I like.
http://www.frommarti.com
I use alot of Pat Yamen's templates
http://www.comequiltwithme.com
For simple shapes like squares and rectangles in various sizes I have my local glass shop guy cut them in about 1/4" thickness plastic. I STRESS accuracy.
I bought a kit years ago, I think it was made by John Flynn's company, to make my own. It was linoleum like material. I don't know if he still sells it.
I was only able to make simple straight line shapes - and my glass guy does it better.