Not only Cezanne looks great, it also allows you to combine the custom LAF with e.g. Nimbus:The WebStart Demo works perfectly on Mac. The real application looks actually better, than the screenshot above :-).
Java EE 7 Workshops: Bootstrap, Effective, Architectures, June, 13th-15th, Munich's Airport
On demand workshops: Java EE 7 Bootstrap, Effective Java EE 7, Java EE 7 Testing and NEW: Java EE 7 Microservices are available for streaming