The technique involves creating the quilt in straight rows, then cutting it apart diagonally on specific lines, then stitching it back together to create the diagonal, on-point effect without having to set in any triangles such as those around the perimeter of the quilt.
This quilt is 65" square and I used a flannel for the backing. I used a pantograph for the quilting pattern and an Egyptian cotton thread, King Tut from Superior Threads, in a variegated green. Here are a couple close-ups of the quilting.