Context Free & Me
So this little gem is not so easy to jump into and make what I want. Originally I thought it would be great for background images, but as it turns out I wont be able to figure out the language quickly. Too bad since some of the art from this app is beautiful.
Anyway, I found an example that rendered an item of interest and tweaked it to give a starry background (looks way better 2000×2000 pix):
