GTK apps do not use any configuration made to the KDE environment. If you want to change GTK themes, you'll need to install a GTK theme switcher. I suggest GTK+ 2.0 theme switcher available @ http://plasmasturm.org/programs/gtk-chtheme
For Gentoo users, just[code:1]emerge =x11-themes/gtk-chtheme[/code:1]
This will at least allow you to manipulate fonts used by GTK2 apps (please note, this DOES NOT change GTK1 themes).
Original von Demon
some apps were optimised to run on GNOME.
Since when? Applications are either built to use the QT, GTK1 or GTK2 libraries. I can't think of a single app "optimized" for Gnome. Just because an app is written to use GTK+ does not mean it's optimized for any WM/DE. Same applies to QT and KDE.