This.

That's how I remembered them when I was a kid. I'm still not sure if it was my TV, my eyes or my head that was broken, but I liked it, it was so damn surreal. =)

(I've been playing with this mod installed for a few days now, so I thought I'd post it here, because why not? Maybe someone else will also like it.)

Put the BlueCaves.kpf into the %game_root%/mods directory.
Example: C:\Program Files (x86)\Steam\steamapps\PowerSlave Exhumed\mods

Here[drive.google.com].