How do I load the Insubstantial Swing plugins to Eclipse?
I refer to the plugins here: http://insubstantial.posterous.com/
Windows Builder allows you to apply any look and feel you want. So, you should be able to add Substance:
http://code.google.com/javadevtools/wbpro/preferences/swing/preferences_lookandfeel.html
Depending on what exactly you want to do, you may still have to do some customization in code.