I’ve been on a cosmic horror kick lately, and what I’d really like to read is stories or novels of the awful and unfathomable on a spaceship. Stories where we go to them, poke what shouldn’t be poked, scan what shouldn’t be scanned, and things proceed from there.
I think because of the coincidence between both Event Horizon and ships in 40k running into ‘chaos’ in the warp.
But as much as people keep making the parallel, it is just as likely that both drew their ideas from H.P. Lovecraft’s ideas of what lies beyond what we know as spacetime in our comfortable sphere.