Breeze Chameleon Dark

The folders change color depending on the Color Scheme You Set Breeze-Round-Chameleon Dark Icons : Here - The icons are based on the Default "Breeze" Icon Theme. __Icons for Light Plasma Themes: Breeze Chameleon Light Icons : Here Breeze-Round-Chameleon Light Icons : Here

Source: https://www.opendesktop.org/p/1281798