Winamp media player includes the ability to apply new "skins". Skins provide a new look by changing color and/or the shape of the player, sometimes with new buttons and other features.

In Winamp's drop down menu, click on 'skins' and then 'get more skins'. This will open a browser and allow you to choose new skins.

Place the downloaded zip files into the "skins" section under your Winamp directory (ex: C:\Program Files\Winamp\Skins) and then when Winamp is running, press Alt-S to browse your skins. A list will pop up and you can just click on each name and see the skin applied to Winamp.