Well, here's what I decided on the quilt ... and I'll add one more skinny border of the deep mauve, I think, and since I've kept them skinny I should be able to both add that last border and bind it in the same thing:
I didn't want to end it with lots of seams on the edge, not only is that a pain to stitch the binding on through, but I've heard that unless you backstitch the outside seams, they tend to come apart when you stretch them on the longarm to quilt. I most certainly didn't backstitch these squares, they were all rotary cut from leftover strip sets from the middle of the quilt! In fact, that's why the middle row of squares is slightly smaller, lol.
It'll teach me to draw all my quilts in EQ first because, I think now that I look at it, I would have liked those dark mauve points to point toward the middle of the quilt all the way around, instead of toward the outside. Too late now!