Tilde made this "Round Dance" block. It is based on the general idea of the Square Dance block.
She writes :
I used the corner unit from the Apple Core collection, for the individual bits. The downside of this is, that you get twice as many as you need, because you can only use one corner for the block. The upside is, that you can make two mirror-image blocks at the same time.
Size of block : 10" square