Ok so this may be bad adveritisement, but still XP

https://play.google.com/store/apps/details?id=com.pingenie.screenlocker

It's really good, you can have two lock screens if you want to!  If you get primium, you can make it so you have to unlock every single app every time your phone is turned off!  You can choose which ones!  If you just get free, you get ulimited uses ad it will take photos of intruders and send it to your email if you tell it your email!  So if you have your friends use your phone, you can make sure they can't get on if they steal it!  Also, if you add the use pin everytime you lock your phone, you can make it onto your photos!  No more embarassing moments trying to hide pictures from your friends looking through your gallery!  Anyways, that's really all I have to say about PG, if you get it you can customize a background just for your PG lock screen.  Once again, this app is

https://play.google.com/store/apps/details?id=com.pingenie.screenlocker

or you can look it up in google play with "PIN Genie Locker"(I will never be a good spokes man XP)