It took me a long time to figure out the placement of the blocks. Rainbow order from one corner, which I would have preferred, just didn't work. This arrangement seems to be the best with the dark red block in the middle, which was confirmed when the sun went down and the block in the middle appeared so much darker than the rest of the blocks.
I'm back to the hare brained idea of adding a border and increasing it to a queen, and not just a plain border, a pieced HST border! I'd best get to it!