Well since I went on a bookbinding course I've been practising a few other techniques. Japanese Stab Binding is perfect for cards so I've been making a few as practice. I love the decorative pattern that the stitching makes.
I've used a couple of good books for reference - Cover to Cover by Sheena LaPlantz is brilliant with easy to follow instructions for sewing (I'm not that good with a needle so this book has made my life easier!)
I've also found some sweet little metal charms that add a nice finishing touch.