I think I would fussy cut the blocks and surround them with two different colors. (Or more if you want to) Say your green, a light green and a red pulled from the fabric. Then to puting it together. . Lay out your blocks pleasing to you and sew them together. You could be very exact about this using all red in the center and surrounding it with the light green squares and the lastly the dark green. The fabric is busy, so I would think that keeping it simple would show off the fabric best. Then I would use what ever color I had in the center blocks for the sashing.