I have taken a series of pictures to explain my concept, but not sure if it will be clear as mud, or a revelation. Please bear with me in this my first attemtp. If this block already exists, then I guess they also had a terrific idea as this post is thought to have been evolved from my playing around with fabric and became my version. Let me know if you have heard of another designer and I will certainly give credit.
For a set you will need three (3) 6-1/2" dark squares and three (3) 6-1/2" light squares, and you can use any size square you want. This will make two blocks.
From one set, put one square of each color aside and cut the four remaining (two of each color) squares on the diagonal to create four triangles for each color. Do you see where we are going with this? Yep - square in a square blocks.
Cut both squares twice on the diagonal resulting in eight triangle units.
Since my original 12 squares gave me eight blocks, I added one extra block here to create this lovely nine-patch arrangement. Hummm... this definitely has potential.