I'm messing around with transparency in kde. What's cool about the panels is if you see in the second gray shot the panels look darker it gives you the appearance of them being solid color. It's pretty cool the panel change density on every wallpaper. I added a little transparency to bespin as well
OS: Arch Linux
DE: KDE 4.8
Theme: bespin Cupertino.100a (that I re-colored black)
Plasma Theme: Black-Transparent with a gradient (by me WIP)
Icons : Kawoken [link]
Wallpaper: I don't remember where I got these.