There was a charming theme for Mac OS which looked something along these lines (and there was another which collapsed elements down to the bare minimum of space

There was a charming theme for Mac OS which looked something along these lines (and there was another which collapsed elements down to the bare minimum of space necessary which was a big help, and wish had been preserved, or re-created on some other platform --- in particular, being able to arrange a line of window-shaded folders and to double-click on any one to make it visible was a god-send on small displays) --- it would be nice if theming were simpler to do/implement.