Mastodon, Gemini and the 2007-reborn Gopher.

But yes, you are right. Back in late 90's/early 00's Linux and Unix desktop were trully different and unique. Fluxbox had zillions of different themes. 3D, black, retro, flat-ish, metal-ish, Java styled, Gnome styled, KDE-alike, Gaudi, childish, Bohemian, alien looking... every style was fine for anyone.

Ditto witht the icons. One day I felt technical and I switched into the Slick theme being "workstation/highend" themed with a gray color scheme, and the next day I felt nice and cheerful and switched into Noia with a blue Keramik theme.

Now everything looks bland, flat and everyone looks afraid on having an style.