We had gotten these texture plates from Wendy’s Restaurant a few years ago. They were smaller, color versions of the Crayon Rubbings texture plates from Chicken Socks.
You can see what the patters look like below. Crayon cookies are excellent for the purpose of making crayon rubbings. They are nice and flat on the bottom and have a large surface area.
The best part of the colored plastic texture plates is that they are great for illustrating color mixing too.