Beautiful fabric, and you used it to perfection! I agree that stitch-in-the-ditch would be great for the pieced blocks. Maybe square in a square for the floral blocks to sort of 'echo' the center of the pieced blocks, but not as much detail. Even easier, if you're worried about so many straight lines, just cross hatch the floral blocks, and the eye would be drawn to the pieced blocks that you worked so hard on!