It’s becoming more common to run a mixture of apps using the QT toolkit (as seen in the KDE desktop) and the GTK toolkit (as seen in GNOME desktop). When using a GTK-based desktop, QT apps may appear out of place by not following the GTK theme settings, this can be fixed using ‘qtconfig’ as follows:
From a console run:
From the graphical menu pull down the “Select GUI style” option and select “GTK+”. Click ‘file’ then ‘save’ and any running QT apps should instantly re-theme and look a lot better!
If ‘qtconfig’ is not installed, it can be installed on apt-based systems by entering:
sudo apt-get install qt4-qtconfig