
Have the user assign tree path colors for Level 1, Level 2, etc.
The currently active folder is assigned Path Level 1, next-most-recently active/accessed is level 2, etc.
Upper level paths get drawn on top of older levels...
Of course if I ever assign an arbitrary color to a particular folder, then I'd want the folder path, and the folder tab, to have that color.

(ps: My yellow Dropbox folder isn't supposed to be part of my example, it's just a color assigned to it a while back)

Edit: After using path tracing for a few more hours, I do have to say that I think having the TAB of the open folder be the same color as it's name in the tree would be useful. Obviously only the active folder tab would have the color. ... Having multiple colored tracings for each folder/tab may actually be overkill, though.