You can take a fish-eye photo with real-time filter effects using this application.
In addition to the fisheye effect, 3 different kinds of filters enable you to apply various shades on your photos.
Quiet shutter-release mode allows you to take photos without loud camera click noises in quiet places.
Compatible devices : iPhone 4, iPhone 3GS, iPod Touch 4G (iOS4.0 or later)
Sketch Pro 
Large Aperture Pro 
Color-Magic 