BreathGTK

Requirements

• GTK+ 3.16

Install instructions

If your distribution doesn't provide a package, you can install the theme system-wide by copying it to the appropriate directory, usually "/usr/share/themes".

To install only for the current user, copy the files to "~/.themes".

To set the theme in Plasma 5, install kde-gtk-config and use System Settings > Application Style > GNOME Application Style. Also make sure to disable "apply colors to non-Qt applications" in System Settings > Colors > Options.

Thanks to scionicspectre, durrik1 and psy-q

https://github.com/scionicspectre/BreezyGTK

https://github.com/dirruk1/gnome-breeze

https://github.com/psy-q/xfwm-theme-breeze