Applications written with the Qt3 toolkit are usually found in KDE. However, GNOME users may find that there are many non-KDE applications that are using Qt, such as VirtualBox. By default, these applications use an ugly Motif theme. You can fix this without installing any KDE dependencies.
Both the Qt configuration utility and the Polymer theme don’t have any KDE dependencies, so they’ll work well for GNOME users.
Install the two packages: