I have seen some piecing in that shape and when I looked at the pattern the diamonds were made with HST but from rectangles, not squares. You would make 4 Identical HST from the rectangle shape, then rotate them so all the colored halves are in the center and the white halves are on the outside--the 4 HST make one block. Then depending upon the spacing you want between them you may need to add a solid white piece i between the diamond shaped blocks. I think it would make a great border!!