Now that Android 4.2 Jelly Bean is the new cool thing, lots of different developers (and weekend warriors) out there have started tinkering around with the code to make something great of it. One of our forum members, Waza_Be, has put up a couple small apps in the forums that he made to add things to the lockscreen and daydream functions of your new Android 4.2 ROMs. They're simple but useful, and should be a good jumping-off point for other developers that are excited to start creating apps with the new functionality.
When you go to the Play Store to check them out, you may recognize the developer's name. Christophe talked to us just a couple days ago as part of our feature on developing for multiple screen sizes. Head to the forums and check out his work at the source link below.
Source: Android Applications Forum