I know it was available in KDE 4 and 5 and haven’t seen it updated for 6 which I understand. It has come in handy to organize some of the more important folders for myself and family like this:

Example of the color folders I use

My question is, is there a different way of assigning folder colors without the plugin? I imagine a custom icon, but I admit, right clicking and choosing the tint made it dead simple! :)