Try this: Install gtk-qt-engine first, then open kcontrol, appearance & themes, GTK Styles and Fonts, click on Use my KDE style in GTK applications. You should have .gtkrc-2.0.kde in your home folder. Edit .gtkrc-2.0 and copy the file from .gtkrc-2.0.kde. And then start pekwm. I'm not sure it if works, but it works for me. Let me know if it works for you.