via Cult of Mac...
"There’s no other way of saying this: Camera Camouflage is sneaky. It’s a camera app that goes out of its way to avoid looking like a camera. It disguises itself as an incoming phone call. You can even instruct it to activate your phone’s ringtone, so you can pretend to take the call and hold the phone to your ear. At which point, things get even sneakier. Camera Camouflage is activated by your voice. When you start speaking, it takes a photo. To onlookers, you’re just answering a phone call. You can keep talking, and keep snapping, for as long as you want." (more)