How can I make KDE and other non-GNOME apps inherit the Ubuntu theme?

"Check QGtkStyle, a project to create a GTK+ layer for Qt-based applications (like KDE) running on GTK2-based desktops (like Gnome).

There are other ideas and scripts in the discussion on this topic at Ubuntu Brainstorm: Idea #1744: GNOME themes should affect Qt themes, and more of them in this discussion Idea #1714: GNOME QT integration (and the numerous duplicate ideas gathered under this question).

One of the noteworthy attempts is UniformUI, which attempts to automate configuration of Qt settings to match the current Gtk+ style, partially using QtCurve and QGtkStyle to achieve this."

"This is specific to Opera, but you might want to try the qt4-linked version of Opera rather than the qt3 version the deb.opera.com repository provides. The qt4 version looks a bit better (the menus and widgets in particular), and thus not quite as out-of-place in a GNOME environment as the qt3 version.

To get a hold of this version of Opera you actually have to do a bit of digging in their FTP server, but at least they provide .deb packages both for i386 (32-bit) and x86_64 (64-bit) for your convenience."

kwriteconfig --file kdeglobals --group General --key widgetStyle gtk