My current KDE Plasma theme Arezzo.
And my current Kwin KDE 4.8.0 theme.
These two themes are easily installed with the Workspace Appearance option in the System Settings panel. These are very stylish themes for the KDE desktop, this is the advantage of running KDE vs Unity. HUD or no HUD, it is still a dumbed down interface compared to the excellent KDE desktop that should be any users default workspace. The desktop shown in the screenshot to the right is my KDE 4.8.0 desktop with these themes applied. it certainly looks very nice indeed. I do not care that it looks a lot like Windows 7, the fact that is a very usable and fast desktop is the thing that really matters.
The best desktop for the Ubuntu 12.04 distribution is KDE, Unity does not even have a chance. That is why the Ubuntu distribution is falling in the Distrowatch rankings.