To make the pieced rectangles, place a Color 2
square atop a Color 1 rectangle, right sides together and all edges
aligned. On the back of the square draw in the diagonal and sew on
the drawn line. Cut off the excess seam allowance and press the
remainder towards the darker fabric. Repeat this with another Color
2 square on the other end of the rectangle. Trim these back to be
3-1/2" x 6-1/2" if needed...