Simple

Deprecated: Simple is no longer maintained. Please use Simplewaita instead, which includes updated themes such as Plasma (although it's not instantly installable as this one). Simplewaita's qt and Plasma themes and files are inside its kde_plasma_qt folder.This is a lightweight dark theme using mostly the same colors of another theme of mine: Soil. It is dark, with green accents. Disabled elements are brown. It is very easy on the eyes. It looks very much like old desktop themes from the ninetie Source: https://www.opendesktop.org/p/1838513