Nowadays is Vimix-theme ( dark/ruby ).
I used to use Adapta gtk-theme ( dark/deeporange ).
Both themes are available as snap, which allow snap app’s to be themed accordingly.
Adapta is no longer maintained by its creator.
Vimix looks a bit more finished :
…the authentication dialog box was a bit broken in Adapta dark mode.
Vimix plays nice with pixel-saver and global menu ( even if I try to leave global menu since it will soon or later be broken ).
I quite like the green or red text to catch attention on recommanded or important action.
What matters to me :
⋅ ability to chose an accent / dominant color ( I don’t want blue )
⋅ availability in .deb and snap ( as long as snap is a thing, at least for chromium )
⋅ dark mode
What I’d like :
⋅ themes with easy Qt equivalent ( for Scribus, Krita, Kdenlive ),
⋅ being able to set transparency for panels ( ie. 60% transparent for horizontal panel, and 90% transparent for vertical panel ),
⋅ blur « behind » transparent areas.
→ last two are pure cosmetic / aesthetic details. First is a real concern.
I don’t care about :
⋅ macOS / Windows look alike
⋅ CSD as most app’s I need for work have « big » menus ( LibreOffice, Gimp, Scribus and almost all « serious » editors - CSD are fine in more « minimalist » app’s ).
Emphasis on I / me cause it’s my own point of view in my very own workflow.