If you like KDE, but also want to use some Gnome applications, if they would not look so ugly in KDE, here is the solution.
There in a plugin that allows GTK applications to use Qt widget styles.
Its fairly easy to use, most distro’ s have it installed and can be set up with Kcontrol > Appearance and Themes > GTK Styles and Fonts.
If its not available by default in your distro, a “gtk-qt-engine” package is probably available the repository. If not, here is a download page with some instructions.