JLAFChooser provides you possibility to choose any from available from
classpath LookAndFeel's. In Swing applications you as usual set
LookAndFeel in your code, so user usually can't choose LookAndFeel by
himself. JLAFChooser will give you possibility to choose LookAndFeel
in running application, and, for example, save it's name in
application settings to apply at start.