install : extract the folder ArfArf in /usr/share/themes/
Simple, blue and dark... Can we hope better ?? :))
Seriously... lightweight, and no too ugly ... That's All folks !
(there's also others files called _.Xdefaults, WindowMaker and bak.png. Replace your ~/.Xdefaults by this one if you want that mofifs apps (like emacs, netscape) look in the same way. If you use the window manager Window Maker, the two other files can be usefull too : put them in your ~/GNUstep/Defaults/ directory... reload Wmaker and see ...)
Mathieu