@xyzzy: That's a great suggestion. That's what I was looking for. Since MB uses .NET Framework for functionality, drag n drop style wouldn't be a pain to implement.
@paq: I think only 1 or 2 skins have rounded buttons, but the skins didn't attract me. So I don't have a choice.
When I meant panels to be of different colors, the panes should be distinctly visible. For instance the Now Playing window should have a different color from the Main window, which is different from the Left sidebar and the Bottom controls. Yeah I know the neutral and multi colored skins achieve this to some extent, but the full potential isn't realized.