Try quilterscache.com, Square upon Square and Squares Within Squares 2. Not exactly what you are looking for, but close. Or you might try this. Cut a 6-1/2" square. Sew 2-1/2" x 6-1/2" strips to the sides. Then sew 2-1/2" x 10-1/2" strips across the top and bottom. I tried to figure out the finished square, but it's early and I haven't had my coffee yet, but you get the idea. Have fun! Both my GDs are learning to quilt (8 and 11 years). One is doing the disappearing nine patch and the other a snowball quilt.