I used 10" squares of the two fabrics and sewed them right sides together all around the outer edge with a 1/4" seam as below.
Then I cut the squares twice corner to corner like so.
Each produces 4 seven inch HST's.
Every other row is reversed.The king size quilt required 289 squares, 17x17 rows, measuring about 108" square. To see the wedding quilt scroll back a couple of posts.