Monochrome colorscheme which is part of the Soft Glass look-and-feel package. Obviously, change the red highlight to whatever you prefer.

For the needs of Blur-Glassy-Plasma Themes, located here: https://www.opendesktop.org/p/1267335/

A simple KDE Plasma color scheme based on Breeze Dark.

openSUSE-Tumbleweed Dark-Blue Plasma Color Schemes

Example theme for Reactionary-KDE1. Colours taken from shots on kde.org. Tastes were much different 20 years ago ;P

Blue & black colorscheme for the Reactionary-KDE1 window decoration - https://www.opendesktop.org/p/1265970/

https://www.opendesktop.org/p/1265472/

openSUSE-Tumbleweed Dark Plasma Color Schemes (partially changed) It is well-suited (in my opinion) with a plasma theme: openSUSE Tumbleweed Dark-Transparent 1.0 - here Also fit the icons: Tumbleweed-Leap Breeze Icons 1.0 - here You will get window transparency with: Plasma 5 Windows Blur - here

openSUSE-Tumbleweed Dark Plasma Color Schemes

Apu's color-schemes