One of the most useful root apps is the Xposed Framework. This allows you to make all kinds of Rom style mods to your device without having to actually install recovery and a custom rom. A new Xposed module allows you to add widgets to your lockscreen. This is great because it means you can add widgets like your clock, toggles, and plenty of other widgets which allow you to be productive without unlocking your device. This will work on your stock Lollipop rom. Grab this from the link below.
via XDA