I added a flashlight app to Wifey's iphone but it uses the display LED, not the flash. The display just looks like 2 lightbulbs.

I also added a pest repeller app that's supposed to emit an ultrasonic noise from the phone to repel skeeters.

There's also a ghost radar app that's pretty cool. It didn't come with any instructions so it's confusing what all the crap is that shows up on the display.