sidux-highway is a KDM theme as a modification of the Sabayon KDM theme "Open Future".
The highway picture was taken and modified by me, the go.png is taken from "crystalline black" icons (kde-look.org #46349), session.png and system.png are modified nuoveXT icons (kde-look.org #26449). The small pictures inside the monitor and folder are sidux wallpapers.
changed wallpaper and icons and resized and repositioned the userlist slightly, added missing screenshot
The highway picture is widescreen 1920x1200. Should be easy to resize it if needed. For your convenience I also have added a 1024x768 version, just rename it if you want to use it instead of the WUXGA picture.
To use the theme untar it to /usr/share/apps/kdm/themes/ and either change your /etc/kde3/kdm/kdmrc manually or use kcontrol if you have the kdmtheme module.
ATTENTION: If you use a display height other than 1200 the position of the login area (that half transparent stripe) will be different from what you see in the preview. If you want to have the same position with another display height you can easily adjust it by editing the file highway.xml with your favorite text editor. Just go to line 49 and change the y-value that by default is "-485". It's an easy rule of three: let's say you have a display height of 800: 800x485/1200=323 - go and replace -485 by -323.
BTW: If you just want the wallpaper: http://www.kde-look.org/content/show.php?content=52780