When sewing fabric this small together, you loose 1/3 of the size to the seam allowance. Left side is the same number of squares as on the right, but the size goes down from 12 x 18 inches to 8 x 12 inches.
I also added some black 2 1/2 inch squares to the mix (which made for some interesting puzzling while sewing the whole thing together)
Eventually I ended up with a 21 x 12 inch large piece, which I quilted in the ditch and bound nicely.
Anthother scrappy project is also in the works, but crochet instead of sewing. I'm using yarn I've still got left over from the Greenway blanket, so basically the same color selection (brown, blue, gray, and some off white)