If you think Linux is boring, lacks eye candy you find in Windows (esp. Vista); you haven’t seen a Linux desktop running Beryl.
Beryl has added all the eye candy that Linux desktops lacked, now definitely it looks better than Windows XP and in my opinion better than Windows Vista as well.
Here are some screen shots to prove it. 😉 (it is not faked)
Running: Fedora Core 6, GNOME
Rain effect (Purely eye candy):