I finished my little bag!
Like I said before, it's smaller than I thought it would be. But as it turn out, it's the perfect size to hold one ball o yarn. And the right single crochet stitches are great for holding my hook and needle. I just thread them through a couple of stitches and they stay put. So this is now my "take it with me so I can crochet while I wait for people" bag.
It won't hold a large project, but for what I'm working on right now, it's pretty perfect. It could use some kind of coordinating trim at the edges, but I don't have any yarn that I want to use for that right now, so I'm leaving it as is.