The only ones of those I like are the waves and the space ones. However, I think even both of those could be a lot better. To explain better, because I feel like a jerk:
-I really dig the waves one, but the waves are just too close together. Waves aren't on top of one another in the ocean. The first space one just looks patchy. Like it doesn't look like one picture, but just a ton of small things thrown together. The second one just looks way too unrealistic.
On your edit:
I get you bro. That makes sense. I'm really liking your feedback.
On another note, space has no color at all, so all "space fabric" is really unrealistic. When we see a picture of space (let's say gas clouds) they have been colored using infra red. But I understand what you mean by not really realistic. To me, the best space fabric out there is the QL cosmos.