These screenshots are of the latest KDE 4.2 on OpenSUSE 11.0
The plasma theme is Silicon and the widget style and window decorations are Skulpture. The colors are the default oxygen edited slightly and the icon set is default oxygen. The wallpaper is called Spawn and I think I downloaded it from Deviant art a long time ago.
The third wallpaper is "Sled Dogs" by Icerock from Flickr.com