Not exactly square, but in the tradition of crocheted granny squares, these granny hearts are made with brightly colored yarn left over from other projects. I found the pattern at a new-to-me blog, Yarn Pumpkin. (Thank you, Yarn Pumpkin, for sharing your pattern!)
I crocheted the hearts using a size J hook (6 mm) and assorted cotton yarns. My finished hearts are approx. 7.25 inches wide and 7.5 inches high. The hearts are super easy to crochet, and I made all five in an evening while watching the Olympics.
My daughters told me the hearts are too pretty to use as dishcloths and that they would use theirs as a coaster or doily.