I'm a longtime fan of Linux and have used it as my desktop of choice for years, but apparently you and I have a different idea of what "beautiful" is. That screenshot is a ghastly smattering of black, grey, and red, with no unified look or feel. Sublime Text is really good looking in its own right, but that overall desktop doesn't look appealing to me.

Granted, I use Gnome Shell for my desktop of choice, and find that much closer to my definition of "beauty", while KDE4 is busy chasing some idea of beauty that more resembles a mish-mash of Win7 style glass that spends more time distracting my eyes than allowing me to work, so take my opinion with a grain of salt.

I think OSX has come closest to the mark of "beauty" from a desktop environment, but it's such a terrible window manager compared to X11 that I can't stand using it except when I have no other good choice. Even then the only thing keeping me from insanity is a set of third party window managing tools that still only get me about 50% of the way to where I want to be.