Hope this is the right place to post this message. I'm not a java developer, just got pulled into a project to coordinate finding icons for our application.
Where do you get your icons? Do you use the Sun graphics repository as a starting point and then create them in-house or hire a designer?
I would browse the web. You can use any GIF or JPEG for icons (though they should be small). I am a cheap bastard, though. If it were for a commercial application, I would consider hiring a graphics designer.