I have found my solution, and I am very pleased with the results. Even as I cringed from how the color clashed with the white coved ceiling, I was admiring how lovely it looked next to our stained wood trim. The whole room glows. This particular paint is formulated to work well with stained wood trims. It's part of a special series from Sherwin Williams, and as far as I can tell, the colors in this series don't have varying shades from light to dark, so trying a different shade of the same color wasn't an option.
I had the brainstorm of trying to find a paint that would match the color of our stain. I know stains are nuanced and paints are monotone, but I thought it was worth a try. I called the nearest paint store and asked if they did color matching. They did, so my husband found a piece of scrap wood in the basement stained the same color as our living room trim (there's a reason to keep odd piles of things squirreled away!), and off I went. For some reason, and I don't know where I got this idea, I had the expectation that "color matching" involved high tech equipment, and I was eager to see how all that worked. Imagine my surprise when the guy simply grabbed a book of color chips and started flipping through it! I was disappointed, not to mention dubious.
However, the first match he showed me was right on the money. I bought a quart in a semi-gloss finish to best match how stain looks. The first coat went on kind of streaky, but amazingly enough, the streakiness makes it mimic wood grain pretty well. And the best part is, the color is the perfect buffer between Hubbard Squash and Flat White!
The white ceiling no longer bothers me. Today I can put my room back together, and when I'm settled back home in a few weeks, I won't have this project still hanging over my head.
Technically, though, the project will still be hanging at my feet, because you know a home improvement project cannot really be THAT easy. I mentioned before that the previous home owners were sloppy painters. Even though they moved out over a decade ago, their footprints linger in our home (quite literally in one room, but we put a throw rug over that!).
See that white strip between the baseboard and the wall? Doesn't it look like I stopped short with my painting? That white strip is the very top of the baseboard. When the previous homeowners painted, they didn't take time to tape the baseboards first. They just painted it the same color as the wall. Eeeesh. I will tackle this problem later. For now, my furniture is going back in place, and I'm packing up the kids to go visit my parents for a few days. I won't be able to post while I'm there, but I am going to try to set up some auto posts while I'm away to see how that blog feature works.
Thanks again for your suggestions! They helped me think through to my eventual solution.