Since it was my birthday last week, I decided to treat myself with a 2-hour class at a local yarn shop. Armed with a little birthday money and a tunisian crochet hook I had never quite gotten around to trying out, I finally learned this "in-between knitting and crocheting" stitch. My favorite part about the afghan stitch (or tunisian crochet) is that it creates perfectly square stitiches, which is a great canvas for cross stitching.
Here's a great site for learning tunisian crochet.
I had made a little purse for A8 about a month ago and H4 has been waiting ever-so-patiently since for me to make her one. I finished the purse quickly and added the button and crosstitch. H4 loved it!