Those are usually hard corn, so it would probably taste pretty starchy once ground into cornmeal. Now that I think about it that would probably be a yummy cornbread, like a less sweet cornbread. They may be able to be popped to make popcorn, but in my experience the colorful corns make pretty bad popcorn. The taste is good but there’s a lot more hull relative to the starch compared to yellow or white popcorn, which makes them more tough and less satisfying to chew, at least to me.