This is a fun granny square and is really simple and you can make it any size. I can see this square being used in a contemporary granny square blanket with diagonal stripes or  any quilting patterns that are created with right angles.
I also got this square pattern from the book Beyond the Square Crochet Motifs by Edie Eckman. I haven’t decided how many squares of this pattern I will need.
I will see you later,
Karen