Do your GTK applications (i.e. Firefox) look like something designed in the 90’s in KDE? I think I can help you.
I installed the latest Firefox, (not the one in the screenshot, I stole this.) and was very disappointed to see something like the following:
Tyler pointed me to the Gentoo guide here, which helped me find out which packages I needed.
If you install Chakra-Gtk-Config, and either oxygen-gtk or qtcurve (make sure to download the gtk2 theme), you will have better looking GTK applications in no time. Note that there are probably tons of other GTK themes for KDE4, these are just some suggestions to get you started.
That is much better.
Thank you very much for the tip?
But now how about gtk3 apps like most official Gnome applications e.g. Cheese, Rhythmbox?
I could install oxygen-gtk3-git from aur on my Arch box but I like qtcurve better. Is there any gtk3 port for qtcurve?
@makkay: Unfortunately, QtCurve is not available for GTK3, as the GTK theme API has changed. This is noted on the QtCurve page on kde-look.