Then cut (4) 4 1/2" squares of one color and (1) 4 1/2" square of the other for 1 block. Tell me the finished size of the quilt you want and I will see if I can figure it out. I have a quilt calculator to help figure the yardage. I am new at this, but I will try for you. Figure out how many blocks you want for width and how many for length, or the finished size of length and width. Have you made a 10 minute block using the finished size as 8"? I know making the 12 1/2" block with the 6 1/2" center is difficult enough. It would be difficult to make the 4 1/2" center. Try one block and see how it is for you.