Have you looked through all the patterns at
http://patternspot.com/ ? It looks like a place for different designers to sell patterns.
At first thought, I was thinking it was a 9-patch with the pinwheels in the corners. You might be able to piece it like a 9patch, but the longer pieces might be easier done as a bar. But if you piece the longer pieces as a long bar, then the blocks are intertwined. In the photo, the bars don't appear to be pieced, they appear to be a single bar.
I'm stumped, unless the longer bars are pieced.