On one of my desktops, I run the Trinity desktop environment with the Plastik theme. For consistency with some newer Qt5-based applications, I also use the "Plastique" widget style via Qt5ct, which is a reproduction of the original "Plastik." I'm running Debian 13 on everything these days and noticed that they failed to include the plastique, motif, cleanlooks, and gtk2 platform theme packages in the Trixie repo. Other than the gtk2 platform theme package, they still work on a Debian 13 system if manually installed. I mentioned this in my "Revisiting the Trinity Desktop Environment" post awhile ago with instructions...