What, no love for the glorious Brushed Metal Finder?I’ve made mention of this elsewhere on here, but there’s much about Aqua’s semi-flattened final evolution with the Snow Leopard UI which, to this day, remains the best of nearly every aspect of using a Mac.
The other stable place in Mac OS X/macOS’s UI is the honed Marble UI/UX in Sierra/High Sierra (though I do use a utility to change UI text from San Francisco back to Lucida Grande — the latter being easier to glance at and read in both regular and hidpi displays).