The gray and plain QtCurve style for KDE4. Goal to allow a clean and simple UI. Color schema can be found with same name.
TIP. Use QtCurve 0.69+ to have a experimental Ctrl+Alt+M feature to hide menus from applications like Kontact, Kmail, Amarok, Kwrite and so on.
The feature is stored per application. So by example, every received Email what you open to own window, has menu shown, even that the application itself would not have.