We just got our new templates from the printer last week and can't wait to use them. We made a simple one out of cardboard last year to test it and decided to go all in this year. We worked with a local Fort Wayne printer who has a machine that can route these out of 1/18" plastic material. They turned out great, were not that expensive, and are completely washable & reusable.
In most street applications, we'll be using spray chalk and on grass or dirt applications, we'll likely use marking paint. The spray chalk can get expensive and isn't readily available locally, so we have to order it. You can pick up marking paint just about anywhere.
We need a bit of practice to reduce overspray, but all in all these are going to be great for our events this year.