The iBeat headphones with EL-illuminated wires flash and blink to the beat of the music with the iPod, iPod Mini, Shuffle or any other MP3 player with a headphone jack in pink, blue, aqua, orange, white and green colors (depending on which one you buy!). 

Pretty cool way to show your iPod around, don't you think? The iBeat  requires 2 AAA batteries for power and it's available for US $29.97 from here.