this tutorial, but then I had to adapt the size, I've also changed something on both sides and I've added a zip. (Do you like roses? I do, and my DH knows it! He's romantic, isn't he?)
Good news is that, while sewing, I could remember quad 19, not exactly but almost that pattern. I'm playing a little with that, I think the second one is better, both in pattern and colours. I don't know if it's original, but I haven't copied it. You'll see more in a week.
If you want, you can give to my little pink pig Ping a trial: I've uploaded the pattern on flickr.