A friend of mine taught me to use a wave looking stitch which can usually be achieved by stretching out your zigzag stitch if you don't have a decorative wave stitch on your machine. To stretch out the zigzag stitch try lengthing the stitch width and length dials. Practice on a piece of test fabric first to make sure it looks right. I use this type of stitch on the majority of my quilt bindings. Its fast and very forgiving. No worries about sewing in a straight line for the most part!