I went with some square-in-a-square cornerstones and a piano key border to finish it up. I had sketched out a couple other ideas that looked good on paper, but in reality they just seemed muddle things up.
"Keep it simple" seemed to be the way to go. No need to get all fussy for fussy's sake.
We'll see; maybe I can fuss-up the backing a little. Or not. I do have some corner triangles trimmed from the square-in-a-square blocks and a failed curvy piece or two, and you know how I love leftovers.
All those cool Georges Briard shapes I had hoped to translate to fabric didn't, uh, materialize. However, I have an idea to quilt some of them into the cornerstones. That ought to be interesting and fun.
(Am I making up the cornerstone verbiage? Are the blocks in the corners called something else?)
I still need to edge-stitch around the appliqued pieces. They're just fused on at the moment.
And all that blather in my last post about shaking things up, well, as it turned out, there's not so much shaking here in the end. There's a definite symmetry, control, and balance. I think a little whimsy and fun, too. Overall, I'm quite happy with it!
On to the quilting of it now, although I may take a break and do something else for a while first.