Get the Mac feel in your desktop with IMac, an Audacious skin in Mac style. Actually it's a Winamp Skin, but since Audacious can use Winamp skin you can apply it easily.
Here's the screenshot :

Now, how to add and change Audacious skin :

• download IMac skin for Winamp,
  
• place it in /usr/share/audacious/Skins , you need to be a superuser or administrator, (run Terminal, type sudo nautilus )
  
• run Audacious -> Preferences -> Appearance, choose your new skin

keyword : mac skin audacious