I was trying out everything KDE 4.1.3 gives me and loved this desktop theme Elegance.
Of all the above, I finally set Elegance as the active theme:
Wallpaper belongs to the KDE 4.2 defaults family. I really like this black + green combination.. very soothing! Since about one whole week, I have it on now.. Wow! that’s the longest time I haven’t fiddled with the UI!