I can't believe all this is over GUI themes. I like my standard Aqua look.
I also just have to respond to the "apple didn't invent the GUI..." comment early on...
You're right, Apple didn't invent the idea of mouse-moveable panes and listed choices that you can click on (amazing features of the Xerox Alto and Star *sarcasm*), but they did invent practically everything else about the GUI, most importantly a computer where the user saw exactly zero command lines.