Different Homescreen and Lockscreen Wallpapers

I recently got my self a nexus 4. This is the best thing i have ever had and used, everything works flawlessly.. There is one thing that bugs me though, you can not have separate home screen and lock screen wallpapers. I was wondering if there is a tweak or app.. My phone is rooted and an app or tweak would be awesome but I don't want to get a ROM.. I have tried Multi picture live wallpaper and that does a horrible job! Sorry if this basic and simple question. Thanks in advanced...