I had some prototype somewhere, but never finished it. Basically due to the fact that you can actually just output QML on the lock screen (and have it display in LPM), that makes things simpler compared to doing it via rendering images. Let's see if I find time to dig out that code.. (it's a QML plugin, so you basically don't have a daemon running anymore, but if you instantiate a Billboard QML element, it will show the Billboard content in your app / lock screen).