I just love these.
It's hard to find a good tutorial for this. I drew from a few sources, but there was a lot of figuring out on my own going on. You could use any cord or string for this, but I recommend the stretchy stuff because it moves with your hand better. If anyone expresses interest, I could turn this into a how-to.
MinnieMuch posted this project as a creation without steps
Here are some similar tutorials to help you make this one!