Here is a free tutorial for the crochet puff box stitch! This stitch makes a wonderful afghan because of the magnificent texture that it adds to crocheted yarn. There are many textured crochet stitches out there, but this one is definitely a favorite! Do be prepared, however, to have a TON of yarn on hand, as this particular stitch does use a significant amount of yarn, especially if you intend to create an entire afghan with it. We have also included a video tutorial for this one, right below this link.
Image and Tutorial/Pattern Source: mypicot.com