Just testing ideas using Octane and Modo.... how about some Nebula HDRIs?
This was rendered at 16000x8000px as a test. Unfortunately it came out ... quite fuzzy. I plan on somehow fixing that but it's a bit tricky seeing how Octane's volumes and materials work. Below are screenshots of me just testing out the HDRI in a 3D environment. Depending on how this all goes I may or may not release this as a pack.