I leave to you the last application that I've done. It's an application that makes pictures really fast, without having to open the camera application (it takes time to open). You simply touch the icon and make a photo with focus and flash in automatic mode. It's up to 3 times faster than the camera application preinstalled!
Instant Photo Shot on Google Play
Images:
Enjoy!!
Instant Photo Shot on Google Play
Images:


Enjoy!!