Is there a way to change the desktop color with a macro?
Keyboard Maestro cannot set the desktop color, but it can set the desktop image.
And it can set an image that fits to the screen and thus has a background color to fill the rest of the screen.
And you can easily create an image that is entirely transparent.
So:
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This is great.
And is there a way to set that background color programmatically — say, so that a macro could run once per minute, slowly rotating through the hues in a color wheel?
Only by creating the action via XML and executing it that way.
Somehow I’d missed that this was a thing one could do. 
Wow!
Right. I’ll look down this XML rabbithole soon....