At this point, I laid 30 blocks out on the floor....setting them 5X6.  I cut a bunch of sashings in various colors 2.5" X 12.5" and laid them between the blocks. The use of sashings means that there are even LESS seams to match up with you sew the blocks together! Then I went to my scrap squares bin, pulled out a bunch of 2.5" squares also in various colors and used them for the cornerstones.  I assembled the blocks and sashings into rows and then sewed the rows together.