gColors

Source (link to git-repo or to original if based on someone elses unmodified work): https://gitlab.com/Joker13/kvantum-themes/tree/master/gcolors-kvantum

Description:

[Instructions]
-Copy files in /home/user/.config/Kvantum
-Open Kvantum Manager
> Applications Theme
> Select gcolor theme, write application names and save

#####How to put different colors in window decoration?
+ Go Window settings> Application style> Window decorations> Select Breeze
+ Install the color schemes in /home/user/.local/share/color-schemes
Downloads ColorScheme https://www.opendesktop.org/p/1293988/
+ Open Application to which you want to change the color of the window decoration
+ Right click on this> More Actions> Special Preferences of the application> Appearance and corrections> Mark Color scheme of the title bar> Force> Choose outline color> Accept