I'd like soapUI to use the system Look and Feel (Windows Classic, Windows XP, Linux GTK etc.) for its GUI. This way it would feel more like the other apps I am running. For a Swing application this can be achieved by calling javax.swing.UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()) at application startup.
Since the soapUI users are used to the current L&F, this has probably to be configurable.
A possible problem is that all dialogs have to be tested with different L&Fs to see if the layout works (in theory, the LayoutManagers should deal with different L&Fs automatically).