I like # 3 myself. I did a similar quilt using all blue scrap 2" squares, sewed them into 16 block units like yours (4 over and 4 down) then I used a cream on cream solid block of the same size as the 16 unit pieced block between the pieced squares. It has has a nice country look. Wish I could send you some pics, but not techy enough yet to do that!
yvonne in NY