Joining blocks with an invisible stitch. Marianne, you'll want to do this on your blanket! (And now I can finish mine, since I never liked the connecting stitches I had!
Triple Puff Granny Square Motif Free Crochet Pattern by joy
Granny Square Baby Blanket Free Crochet Pattern by Daisy Cottage Designs. I like this color combo
Diamond Granny Square Motif By Brittany - Free Crochet Pattern - (bhookedcrochet)
This takes the traditional granny square afghan to a whole new level! The three-color Weekend-Wonder Giant Granny Square Throw from Red Heart Yarn is made from the center out in one piece, so that there are no seams to sew once you finish.