Like those electroluminescent tees that respond to sound, Strapya World will soon be releasing an iPhone 5 shell case featuring a light-up graphic EQ on the back that responds to music, conversations, and even your ringtone.
At $US32, it's relatively cheap, given what it does; just don't expect it to go unnoticed when used with your iPhone 5. It almost doubles the device's thickness and there's a faux plastic mini boombox hanging off the top that's not removable. It does use its own batteries though, so it won't drain your iPhone's when the music really gets pounding.
The case should be available from Strapya World sometime in the next few months.