Want to feel what gestures can do? Here's an application which will let you turn off/on your screen just with a swipe!! Swipe your hand over the proximity sensor (Located near the earpiece on top of the phone).

Features:
• 3 modes to turn screen off: Timeout based, Root Screen Off support fingerprint sensor and lastly traditional method, DeviceAdmin screen off.
• Support for tablets with Light Sensor only (Make sure you set sensor sensitivity to low).
• Tasker integration with quick service start/stop toggle
• Schedule start/stop of service (Save battery power during night)
• Pocket/Flip or Smart Cover Mode: Turns screen OFF when sensor covered and ON when uncovered. (Feature requested by Galaxy Note users)
• Turn Screen On/Off with following gestures:
1) Swipe Once,
2) Swipe Twice,
3) Swipe and Hold,
4) Hold and Swipe and
5) Cover and Hold
• Ignore Apps list: Add the apps/games where you want to disable the service
• Widget: to start and stop the service
• ScreenOff shortcut: to turn off the screen by launching the app.
• Sensor Configuration : Based on your device select the sensor of your choice, or the one that's available and configure their values, as they are different for different devices.
• Enable screen on/off during calls only
• Disable call handling completely
• Battery Saving options:
1) Option to De-Activate sensors after timeout
2) Option to De-Activate sensors if power button is pressed or phone goes idle
• Override power button and screen-on by other apps (Phone is in pocket and you get a call or you accidentally press the power button, screen will remain off)
• Prevent accidental screen on
• Disable accidental lock - in Swipe to Screen Off mode if the sensor is covered for longer than specified duration screen wont turn off
• Vibration on screen On/Off

NOTE:
• This app uses the Device Administrator permission - which is required to Turn Screen ON/OFF
• App needs SDCard read/write permissions for debug logging support
• If app does not work with flip cover but works with hand, then try
a) Enable No-Recognize Delay and add about 4-5 seconds of delay
b) or try pasting a white piece of paper on the cover where the sensor is located, that will help the detection.

• If Gestures or any other settings (like lock-screen) are not working, please Clear app data from 
Settings -> Application Manager -> Proximity Screen Off Pro -> Clear Data

• Default timeout after screenOn will be system display timeout. can be overridden by "Avoid screen Flickering"

• Removing/Uninstalling the app
- Launch ProximityScreenOff Pro and click Uninstall button
- System Settings , "Locations & Security" or just "Security" , Select Device Administrators and disable the ScreenOff App

• App needs Device Administrator privilege to lock the screen, If you have any questions on permissions used by the app, please send me an email and i will explain you the reason app needs them.

• To enable lock screen - Use option "Locks phone on screenOn" under "All settings"

Reviews:
http://www.youtube.com/watch?v=L0AH469emWc
http://www.youtube.com/watch?v=ON9fMwIbk4M
http://www.youtube.com/watch?v=LvMKMQb99pQ
http://www.spigen.com/samsung-galaxy-s3-case-ultra-flip-series-review-11596.html