The Crochet Box Stitch really comes into its own when worked in rows of graduating colors, or in alternating colors. From baby blankets to Ponchos, Afghans, and pillowcases, there's not much you cannot create using crochet box stitches.
"Flat Braid" Square Joining Method for granny squares. Creates a lovely edging! Another method of joining squares, a simple ch 3 interlocking, done as the last rnd on the squares. Join as you go, could not be easier.
Ravelry: Granny patchwork I think this is the most beautiful granny square project I have ever seen! - Love the idea, link describes a different type of blanket, should be able to piece this pattern together from the images.