It is no secret that you could do some very cool things on a jailbroken iPhone. Cydia has many awesome apps for you to try. JellyLock is a cool tweak that adds the Android Jelly Bean lock screen to your iPhone. It also slightly changes the way you go about unlocking your phone. You will be able to access the camera and launch applications straight from the lock screen. The icons, transparency, and other settings can be customized to your liking.
JellyLock includes 4 themes and allows you to add your apps to the Lock Screen launcher. The tweak is developed by Max Katzmann. You need to add http://cydia.myrepospace.com/maxkatzmann/ to your Cydia sources to get started with it. You may not be able to run Android on your iPhone but tweaks like this give you the next best thing.[Video]