I was holding this in my hands trying to figure out what was in the middle of the rings when I opened opened your post. Sorry for the bad scan but I just had to share...so weird!
I'm so glad you figured this out I just love the look of them....but I wasn't too crazy about the colors of the one I bought at the thrift store. The colors on yours are a great inspiration. Now I can make my own in any color I want! Thanks!