One of my favorite windows themes ported to kde with qtcurve.
Plasma theme here [link]
How to install:
STYLE: if you don't have qtcurve,install it (search for "qtcurve" on your package manager)
download and extract the archive,open system setting - appearence - style,select qtcurve and click on configuration button,click on import and select the file .qtcurve downloaded.
COLOR SCHEME: open system settings - colors,click on import,select the .colors file downloaded.
SMARAGD THEME: if you use emerald-theme-manager copy the folder "smaragd/appows qtcurve" in ~/.emerald/themes then select it.
If you don't use emerald-theme-manager copy all files from folder and paste to .emerald/theme then select smaragd in systemsettings.
for emerald theme.
License CC by - nc - sa