I usually use kubuntu, but I had to install a custom kernel on my laptop and it's a lot easier with arch. The problem is that kde looks terrible in arch, especially the GTK applications. I know there are all sorts of tutorials of installing gnome icons, and various peicewise fixes, but is there a way to find out exactly how kubuntu sets up KDE so I can just duplicate that?
Kubuntu makes many modifications to various applications (e.g., Firefox, OpenOffice), so it is unlikely that there is an easy way to recreate the Kubuntu look on ArchLinux.
That being said, I moved from Kubuntu to ArchLinux and I now prefer the vanilla applications (e.g., OpenOffice looks much better).
One thing that helped a lot in synchronizing the look of gtk applications with KDE was to install qtcurve, a theme that works for both qt (KDE) and gtk (Gnome) apps.
According to the kdemod wiki, you will need to install this package :
to get a more uniform look for QT and GTK apps.
Also checkout this article.