I’m trying to create a application where the taskbar and the JPanel(for example) has the same color, so that they look connected. Just like Spotify!

My way of doing this was to frame.setUndecorated(true); and then paint my own background and add Photoshopped jbuttons as exit and so on. It works, but! Its not very professional and not "right", I want to do this the proper way. I think they are using C++ at Spotify, but I’m more in to Java. Is that going to be a problem?
I think that Substance or JGoodies has similar themes; more about free Swing Look & Feels,
For Substance you can’t set
frame.setUndecorated(true);because there it modifies the ToolBar, too.EDIT:
Substance (but you have to download the code source) has implemented a preview for all known Java Swing Look & Feels in one
JFrame.