Country quilt pattern.
Templates are below.
It is composed of 2 triangles sewn to each side of a central diagonal strip. Make the central diagonal strip first. Sew each bright A to a medium A. Sew the A-A triangles together, alternating fabric, to make the central square. Sew a light B to adjacent edges of 2 dark C's. Sew each B-B edge thus made to opposite sides of the central A square.