For adults, I always want the quilt to be at least 50 inches wide, and about 75 inches long. If the person is extra wide or extra long, then bigger. I assume that the quilt will be a nap cover and that is a comfortable size for me. You could add more blocks or gaint he large size with piano key border made of scraps. Oh, by the way . . . I love this cheerful and well designed quilt.