The latest series of the K Desktop Environment now utilizes Plasma, a new desktop and panel user interface tool that aims for a more functional, user-friendly, and sleek KDE desktop. Plasma also supports Dashboard-like widgets called plasmoids.
If you want to further enhance the look of your KDE 4 desktop, I have here a list of some of the most beautiful Plasma themes available:
2. Perla Negra
5. Slim Glow