For this block you will need:
4) 4" dark blue print squares
4) 4" medium blue squares
8) 4" background squares
Draw a diagonal line on the back of the 4" background squares.
Match one of these to each of the blue 4" print squares with the outside edges aligned and the right sides together.
Sew 1/4 inch on each side of the drawn line.
Cut on the line.
Square the resulting half square triangles to measure 3 1/2 inches.
Trim off the excess points on the seam and press toward the blue fabric.
Use the photo at the top of the post as a guide to assemble and sew the block together.
Happy Quilting!