How to :: JAYG (Join As You Go) with granny squares, by Sue of Crochet Again. Well-written detailed tutorial with step-by-step photos. Uses SC stitches between granny clusters on the last round & creates nice neat corners.
Stained glass look: This afghan square is fast, fun and deceptively easy to crochet. Use black as your outline for a stained glass effect, or go with a bright or muted palette. You can’t go wrong, and I’ll bet you can’t make just one.