Compatible with iOS 6
For iOS 7 version, try FaceOff7
Turns off your screen when you place your device face down.
It has a few options, found in the Settings app.
To use, simply place your device face down, and watch (from underneath) as the screen turns off! Picking up your device will cause the screen to turn back on.
Please report any issues to: elijah.frederickson@gmail.com or open an issue at Github
Configure options from Settings.