On its website:
To use Sea Glass Look and Feel, you must either include our Maven repository in your pom.xml file, or load the jar file and include it in your class path. See the download page for more details.
Sea Glass Look and Feel, :
try {
UIManager.setLookAndFeel("com.seaglasslookandfeel.SeaGlassLookAndFeel");
} catch (Exception e) {
e.printStackTrace();
}
VM
-Dswing.defaultlaf=com.seaglasslookandfeel.SeaGlassLookAndFeel