So... there's this great website called InspiroBot. that randomly generates "inspirational quotes". The goal here is to get inspired by one of these quotes to write a song about it. Then tag the result #inspirobot
Some of them are pretty awesome, and since there's a downloadable image with the "quote", you have something easy to use as a song cover.
Take this gem, for example: http://generated.inspirobot.me/048/aXm4440xjU.jpg
(The text on this image is: The two things you need in order to bathe in blood is a ghost and a second life.)