Vizualizer ? for music and pandora

Ive got the hub hooked up to my 60 inch plasma that is succeptable to burn in.  id love to use this device in fact a main reason for purchase was the addition of pandora.  However without a vizualizer of some sort like all other media centers (xbmc wmc boxee ect ect ) the plasma will begin to get burn in , does this feature exsist?

 also as a side note are there themes i can download

Turn on the screen saver.