It looks like there isn't a way to do this in default Nautilus but maybe there is a version somewhere that enables it.
What I want is to not just change the color between active and normal tabs, but to be able to have a particular folder and its under folders load a theme for that tab.
Two possible ways to do this I would like to see:
To be able to have it done whenever Nautilus hits the location or its under folders.
To be able to right click on the panel and to edit its theme.
Either one would be great. Preferably both.