Here’s a great tweak if you’ve jailbroken: QuickShoot allows you to take quick pictures right from your iOS homescreen just by tapping the app icon. You can’t frame a shot or anything, but it does allow you to quickly (and secretly!) snap a picture of someone without anyone being the wiser: not the subject, not the person looking over your shoulder. And you can even change settings for Flash Mode, Camera Device, and HDR in the settings. Totally rad, and totally free..