These granny squares have been an orphan project for soooo long. I couldn't decide how to join them up. I looked online and found about four different ways-at least-of joining granny squares and I tried each and was not happy. Especially about ripping each method back out!
I liked the idea of joining them with a crochet stitch but it ethier left a bumpy ridge or it skewed the squares and ended up looking crooked.
So, I mattress-stitched them together. :-)
The final size is 15 1/2" X 18 1/2", made of Palette Yarn from KnitPicks, C-hook.HERE. The result looks like ric-rac to me! :-)