Kamikaze
Seconds after posting I realised you could just make the backgrounds transparent to see what a black background looked like. Being the control bar background despite saying its editable, is fixed as black.

 
Well it can be editable, and hopefully will be... someday. I'm just glad to see the transport text now changeable. With Duckbar that was one I could never find as the color 0000 (black) resulted in 100's of possibilities - most of which were not GUI items - so when they were changed to see if they might be, they would crash Sonar. I just ran out of patience and gave up looking for 0000 colored text.
 
Watching all this TE stuff unfold is like reliving history for me - like the transparent BG trick. All png's can be made transparent. I started doing it when X1 came out with a resource editor and later Duckbar and learned a lot about how the "X" GUI was put together.
 
Sure you can spend too much time fooling with the GUI instead of making music. But sometimes it's a nice diversion that exercises other creative areas of the brain, which is a healthy thing to do.
 
BTW you can actually "change" the CB background by coloring each module's transparent layer or adding a colored layer between it and the graphic layer. PNG's can have as may layers as you want while editing them when using Photoshop or PS Elements.