I’ve got some that pulls the picture from Bing and the picture from NASA and set them to my wall paper and lock screen back grounds.

I’ve got another one that silences my phone when I’m at work or church and not connected to my car blue tooth. I used something similar in college to silence my phone when a calendar event was happening. My phone never made a peep during a lecture! It resets volumes to normal levels after the silent period is done.