I made this today in part of my efforts to learn and improve my skills at patten making with Adobe Illustrator's new pattern making tool. This didn't turn out perfect, but I still think it's a lot of tun :)
also, I have attached .zip of this the patterns I have created as illustrator swatches, which includes a few slight variations.
PS. I can't guarantee these will work in illustrator versions CS4 or below.