Ocean, which is a bit softer than the pure Metal look, has been the default theme for the Metal (Java) L&F since Java SE 5. Despite its name, DefaultMetal is not the default theme for Metal (it was before Java SE 5, which explains its name). The Test theme is a theme defined in TestTheme.java, which you must compile with LookAndfeelDemo.java. As it is written, TestTheme.java sets the three primary colors (with somewhat bizarre results). You can modify TestTheme.java to test any colors you like.