Yes, you can make your own, and come up with some pretty patterns.
I have lots of non-commercial templates in my stash. I have jar lids, a thick plastic star given as a gift, bottle caps, a clean round piece of cardboard the size of a pizza, smaller rounds down to a small bottle cap for cherries on an ice cream sundae, a couple of neat plastic rounds that came from a hamburger press (Tupperware?) and lots that I'd have to search through to remember what they were to start with.
Like someone else said, our Grandmothers used every thing their clever minds could find, and they made lovely stuff that is still with is.