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I was actually trying what you were asking and I got a pretty good "random" skin.And I have no idea how to identify it now because it is checked too random only
But it actually seems not working since there is no way that I can see which specific skin I am using.
Open \%AppData%\Roaming\MusicBee\MusicBee3Settings.ini and search for <GUI_Skin>I'm not sure if the file updates while MB is open or only after you close it, but that's where your skin setting is stored.