I found a great tutorial on Tunisian Crochet here. She did an excellent job of explaining just how this is done! In fact, I picked up a afghan hook at JoAnn Fabrics this week and tried my hand at it. This is the result!
I am pleased at how it turned out and already have plans for I can use this for other projects in the works. I think my distortion in the picture above is actually because I scanned the square which puts pressure on it.