You'd probably like GTK/QT. Both of them are effectively delineations of that same functional design language, with holistically different approaches to the subject. I personally love both, but they're a fascinating case study if nothing else.
I'm always wondering whether my preference for this more "traditional" design paradigm just comes from using Win32 in my formative years or some objective difference of quality.
Anyone who shares the sentiment might want to check out the Chicago95 theme[1].