So far I have randomly generated backgrounds. For these I'm using some graphics from my game, Talking Nexus Droid. https://play.google.com/store/apps/details?id=com....
Here's a short video of the background, with a few asteroids floating by and some random comets.
And here's a link for my gitHub source so far: https://github.com/XdebugX/troubleWithTribbles