I wasn't talking about such a thing. I was talking about being able to create a "plaf" theme using a visual editor or at least some rules in CSS or similar script that applies to the entire Swing application (like Swing's own plafs do) and doesn't require creating subclasses. This has nothing to do with having a designer or not and it is orthogonal to it (you can give the tool/rules/whatever to a designer if you want).