The Mattress Stitch is my favorite method of joining my c2c squares or any piece of crochet, really. It gives a nice flat, almost invisible seam that looks great when used on matching single crochet stitches.
by Cakes StepByStep
by world of Art
by Draw Online
by cuns tattoo
by The Unapologetic Knitter
by ThePatterfamily
by ART PLUS