Folder Painter is a Dolphin Service Menu that allows the user to either change the icon of the folder, the color of the folder, or both.
Folder Painter uses Python to operate. In this way, the folder's appearance can be changed with programming and ease of understanding in mind.
Usually, this comes with Tridentu-RK systems. However, as long as you have Python 3.10, this service menu can be used on those systems. Just put the change-folder-color program in a PATH-aware folder, place the servicemenu in the usual location for it, and voila! It should work most of the time, however (there are a few issues with icons).
This program is licensed under the GPL version 2 licence.