@Julia T Such a ridiculous amount of brouhaha for a trivial feature that was available in the early 1990s under OS9 via extensions like ShapeShifter, until Apple made it impossible.
I was more of a Kaleidoscope fan (having been a fan of Greg Landweber from Greg's Windows and Greg's Browser).
Then Apple decided theming was a thing, included it in System 8 and then decided it was not and didn't allow it in OSX. *sigh*
I now look at the styles I loved to use and while some are still nice most are incredibly garish :D
Ironically, the one I liked the most in the end was Apple's own paper-based "Drawing Board" theme, which was only seen in Japan but eventually hackers made it work elsewhere.
Also the time of Window Tabs, control strip and many other features that made working in so small screens a lot more bearable :D
ObTopic: Some of the nicer "Dark mode" tricks I'm seeing make me remind of the playfulness of those times. For example, Microsoft is unexpectedly embracing Dark mode in a funny way, replacing suns in icons with moons: https://twitter.com/AgentAkki/status/1057011899420659712 (tweet with animated screenshot)