I bought the Blue Ribbon Round Ripple dishcloth pattern many years ago. It is a great crochet pattern and makes a beautiful dishcloth. Here is the link to the crochet pattern .
I crocheted two of these round ripple dishcloths. This one is crocheted using the original pattern as written with the popcorn stitch center.
I also have crocheted the pattern using a flat center. The flat center is nice to crochet if you are using the pattern to make a decorative cloth so you can place a dish or other item on it. With the flat center, your item can sit flat and not be tipsy.