This is not a style for KDE, but a style of KDE Keramik
...for MS Windows!
You can install it on every version of Windows from 98 to XP (95/NT not supported)
I just made a screenshot,

Real authors are:
Malte (Keramik)
Someone else from KDE team (wallpaper)
Everaldo (icons) http://www.everaldo.com
and others...
DJP (Ported most of the stuff) - http://funkware.da.ru
some from Xfree4.3 - whiteglass cursor
Y (toolbar buttons & transparent menus) - maker of yztoolbar and yzshadow