I thought this was an especially attractive way to create a frame/disc/circular kaliedoscopic shape. It's from Sage's site as a tutorial, http://www.photoshopgraphics.co.uk/circularframes.shtml.
The enthusiastic photoshopper will find many uses for it. I used a radial gradient behind it. BTW, the little guy is a duck happily swimming in Lake Wallenpaupack, PA.