I figured out the cutting, too, from fat quarters, which is what I have coming, and I can get the makings for the light sides and the darks sides for 3 blocks from each fat quarter. This will leave a 6 inch finished triangle left over, as well as quite a few 2 1/2 inch strips for more triangles for a triangle border as in the one on the right, or for a piano key border, as the one on the left. It might be interesting to combine the left over 6 inch triangles in a border somehow, as well
The one above here on the right is a bit too much, and rather over powers the rest of the quilt, but I like the one on the left. The look of the actual large triangles would be a lot more varied, of course since the larger triangles would be out of a bunch of different fabrics. But this rather gives a good idea of what it would look like. I love playing with the Electric Quilt software. It's like making a quilt, without making a quilt. And being able to download the fabrics is a great way to get a general idea, at least, of the way the final project will look.