Here are 70 free space background images you can use for your game, web pages, videos, or anything else you like. I've got everything from subtle whisps over black to full-on unicorn vomit. They are highly compressed, low-bandwidth, and intentionally low on specific detail for best use as a backdrop for important foreground elements. They were created by compositing randomly generated noise with parts of real telescope images used as screens and filters.
These images were created by leiavoia and are released as Public Domain. That means you can do whatever you want with them and you don't owe anybody anything.
This packages contains 70 images measuring 2500x1400 pixels. Download size is 13.2MB