Flashlight, Color screen light, torch, with strobe and message/sign display.
Find your way in the dark, or be found! Original Droid interactive light and sign-board. Simply TAP screen to open controls. New York Times "10 Must Have Android Apps" honorable mention,
http://www.nytimes.com/2010/12/02/technology/personaltech/02smart.html: "DroidLight (free; its a flashlight, a strobe light or a message board in a ...