The Real Programmers (modern UI designers) use only can think of flat 2-dimensional UI elements in pale monochrome colors. The graphic acceleration and 16.7 million colors is beneath them.
I suffer from the extremely bright picture of black text on white background;
I suffer from the extremely contrast picture of white text on black background;
There is nothing in between.
Winrar was theme-able and still is to this date. Winamp is the best example.
Now days, just like web, most desktop software look same. Innovation in design finished at Apple. All Android phone manufacturers copy iPhone. Windows copy Mac. Even when Linux tried to bring itself to masses, it copied Mac.
Apple has got the cultural victory and has penetrated everywhere.