There are an abundance of various lock screen replacements available for Android, each using a slightly different method of verifying the authenticity of the user---including the standard PIN code or the grid pattern options. Inspired by the Microsoft Windows 8 picture lock screen, XDA Senior member kevdliu has developed something a little more unique.

Picture Password Lockscreen is a lock screen application that allows you to set a custom  image and a custom swipe gesture on the image. You have the option of setting a single point, a point to point line, or a circle gesture. These can also all be used at once in order to make the unlocking process even more complex. The app allows you to of course test your gesture once it's set, to ensure you don't get locked out of your phone!

Another handy feature of the app is the option to disable the ability of the status bar to be slid down in the lockscreen, which has been known to cause the odd accidental unlock in the trouser pocket!

If you fancy giving the app a try, head on over to the app thread.