Simple, neat way to join afghan squares: Whit’s Knits: Bear’s Rainbow Blanket - The Purl Bee
Choose your favorite granny square joining method to join your granny square projects. 12 ways to join granny squares, 8 basic joints and 4 fancy joints. – Page 2 of 2
Crochet Different Joining Stitches - Chart ❥ // hf. This is pretty straight forward. No need for a pattern.
Flat Slip Stitch Join For Granny Squares. Free crochet tutorial for seaming granny stitch squares.