Last friday I've removed KDE from my laptop and installed XFCE, and I must say so far I've been very impressed and happy about it
There was however one thing that I missed, and that was KDE's wallpaper 'Maxpect' feature.
Basically what is does is instead of scaling or stretching an image until it fits the screen, it 'zooms' in on it. So that if you have a wide-screen wallpaper and a 4:3 monitor, it will cut of a small piece of the sides of the image, leaving you with a undistorted, fullscreen image.
I've implemented this, and two other minor features (a saturation and an hue slider, in addition to the brightness slider).
I've provided a patch against 4.4.1 sources, I hope someone finds this helpfull, and if any of these features make it into XFCE I would be very happy indeed