iOS7 is a new, completely redesigned system developed for Apple devices but now it is kinda routine to make a port for every new thing that comes. This time it's the lockscreen brought and ported from iOS7. It looks pretty nice, very simillar to original one and brings the new 3D wallpaper effect. Even if you hate iOS so much you should check this out!
As always, there are a bunch of iOS-ish replicas but this one, I would say, is pretty nice. It offers original iOS look, pin code security, 3D effect and iOS7 Control center.
The app is completely free and available on Google Play Store. For best effect without any problems be sure to have the old lockscreen disabled. App is supported for HD-phones.