clever way to ensure each frame gets a different background color

[Kevin Buchs]

I have to use MacOS for work and Apple has this silly idea that having no
boundaries on windows is good for users. I prefer black background for my
Emacs frames, but if one lands near another, it can be really confusing
without a border. I'm finally mad enough to do something about it.

So I think I want to have a menu of background color that is used for each
new frame. Is there a clever way to do this? I have been using color-theme
so that adds some complication. But, if I have to, I can stop color-theme
use.

Thanks,
Kevin Buchs