I managed to get away from bright flower photos in the past ten days, at least. Mostly.
And am I imagining things, or has WordPress started squishing rectangular photos to fit in the square thumbnails? (Is it WordPress, or just the CSS in the theme I’m currently using?) It wasn’t doing that before, and if it’s going to keep happening, I’m going to have to make some changes.
[UPDATE: Based on the comments, I’m moving over to the new block editor in WordPress, and that’s fixed the problem.]