ITUNES VISUALIZATIONS IS THE BEST. THIS IS WHY:

-everything comes from a complete black screen, when it dies down and comes back alive is awesome on any sort of high. (xbox 360's is fun too, but i like how itunes has personality.)
-you can control it! press..
Q or W to change the mode.
A or S to change the 2nd mode and
Z or X to change color schemes
D is DEFAULT (which actually does a damn good job on its own changing with chrouses and verses and all that jazz)

SO OPEN UP ITUNES, PUT ON A GOOD SONG, HIT CTRL+T THEN CTRL+F TO MAKE IT FULL SCREEN AND ENJOY!