I think you could use any one of the fabrics from your blocks to make the setting triangles and they do need to be added on the ends of each row before you sew the rows together. If your having trouble figuring out how to make the setting triangles there are charts and calculators online. You need to make a block larger than the DP9 block to make the triangles. It's actually very easy to do. I'll look for a chart to post here.
Here's a good one:
http://quiltbug.com/Articles/on-point.htm
Last edited by KathyKat; 03-07-2013 at 07:22 AM.