I've been tinkering with my rendering app for a couple of hours and I have generated a few post-apocalyptic skyboxes that were experimental or just proof-of-concept.
I was thinking about putting up a few of them on the TGS store but Cosmic Prophet is such a generous person I was ashamed to try to profit from something that I could donate instead.
This particular one has six views to create a standard cube in 1024x1024 resolution textures, which results in excellent detail in most 3D applications. I've tried it in Unity but have not dropped it into FPS Creator yet.
I hope with all the upcoming packs that have Post-Apocalyptic themes this will prove useful to somebody. It wasn't exactly the right composition for the game I am working on but otherwise I thought it came out pretty good. Somewhere between Fallout 3 and a kind of comic book feel to it.
(Screenshot attached, reduced to half size JPG for easy loading.)
The best game to work on is the one you enjoy playing the most.