These types of afghans are fun to work because the patterns are typically simple and feature easy-to-memorize stitch pattern repeats. If you choose to work on the first type, you'll be making a never ending granny square afghan by starting to work on a simple crochet granny square that continues getting larger as you keep working around. Discover crochet granny square blanket patterns that are completely free! There are two popular types of crochet granny square afghans: there's the afghan that is essentially a very large granny square, and then there's the afghan that's comprised of many smaller, individual granny squares.