An interesting shift in theming culture I've observed over the past few years: Instead of re-styling the whole system to look like some custom style, people seem more focused on making non-GTK apps like Firefox and Steam look like native Adwaita apps.
https://www.omgubuntu.co.uk/2022/12/adwaita-theme-for-steam-its-a-thing
https://www.omgubuntu.co.uk/2022/07/firefox-gnome-theme-libadwaita-update
@tbernard I wouldn't say shift, I've seen things like that for quite a while.
- Icon themes making tango icons for third-party apps that didn't have them already
- stuff like https://www.gnome-look.org/p/1112405/ and various winamp/xmms/audacious/qmmp skins in the similar vein
