Another easy one.
Print or trace the block diagram onto the dull side of freezer paper and cut out the four sections that have a curved edge.
Out of background fabric, cut 4 squares 2.5" x 2.5"
Iron a freezer paper shape to the right side of the fabric, in the center of each background square.
Out of main block fabric, cut 4 squares 2.5" x 2.5".
Lay the main fabric squares right side up on the table. Lay the background fabric sections right side up on top of them.
Baste through all layers, staying far enough from the freezer paper edge to allow for the seam allowance to be turned under.
Remove the freezer paper and trim away the excess main block fabric from the back of each section.
Out of main block fabric, cut 5 squares 2" x 2".
Lay the block sections out as below.