Disappear. The Chameleon Clock App is exactly what the name suggests. The app uses your device’s rear facing camera to show what’s behind the iPad, which in turn blends the device with the natural surroundings. The end result is actually quite cool, and the app also allows you to customize the clock display to either white or black so you can match it with the border of your iPad. The Chameleon Clock App is currently available for both the iPad and the iPhone on iTunes.