Nothing was ever quite right - or there would be only one.
Obviously, I needed two.
A few weeks ago, I found a pair of matching oval-shaped wooden frames at a thrift store that I thought would work:
but still and all, I think they look pretty good, now that they are finished:
Certainly, though, they are still recognizable.
So, there's that.
And it really WAS difficult to find the right frames - so I'm happy!