UIManager.setLookAndFeel( UIManager.getSystemLookAndFeelClassName() );
UIManager.setLookAndFeel( UIManager.getCrossPlatformLookAndFeelClassName() );
UIManager.setLookAndFeel( new com.sun.java.swing.plaf.windows.WindowsLookAndFeel() );
UIManager.setLookAndFeel( new com.sun.java.swing.plaf.windows.WindowsClassicLookAndFeel() );
UIManager.setLookAndFeel( new com.sun.java.swing.plaf.motif.MotifLookAndFeel() );
UIManager.setLookAndFeel( new javax.swing.plaf.metal.MetalLookAndFeel() );
UIManager.setLookAndFeel( "com.sun.java.swing.plaf.mac.MacLookAndFeel" );
UIManager.setLookAndFeel( new it.unitn.ing.swing.plaf.macos.MacOSLookAndFeel() );
UIManager.setLookAndFeel( new com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel() );
UIManager.setLookAndFeel( new com.sun.java.swing.plaf.gtk.GTKLooktAndFeel() );
com.incors.plaf.alloy.AlloyLookAndFeel.setProperty( "alloy.licenseCode", "xxxxxxx");
UIManager.setLookAndFeel( new com.incors.plaf.alloy.AlloyLookAndFeel() );
QuaquaManager.setProperty( "Quaqua.tabLayoutPolicy", "wrap" );
UIManager.put( "ClassLoader", getClass().getClassLoader() );
UIManager.setLookAndFeel( "ch.randelshofer.quaqua.QuaquaLookAndFeel" );
Skin theSkinToUse = SkinLookAndFeel.loadThemePack( "themepack.zip" );
SkinLookAndFeel.setSkin( theSkinToUse );
UIManager.setLookAndFeel( new SkinLookAndFeel() );
UIManager.setLookAndFeel( "com.pagosoft.plaf.PgsLookAndFeel" );
SwingUtilities.updateComponentTreeUI( yourFrame );