KDE 3 using Mosfet's Liquid (which kicks ass btw) and a modified window decoration for which I cannot find the name. I found the original on here on kde-look. It is listed in the IceWM theme selector as "MattsDecCol". The only things that are always visible are the pager (lower left) and KasBar (right).
Some people thing it's too much blue, but I think blue is one of the few colors that's not so bright as to cause eyestrain after long periods of time.
Oh, and Snoopy & Woodstock dance :D