The interesting thing is, that's kind of similar to the way I've always pictured God, ever since I was a little kid. I always imagined hundreds of black tentacles against a dull, gold background, but not glowing. The whole thing is kind of fuzzy and 2 dimensional, instead of 3, sometimes with a few human attributes like a hand or a somewhat dark skinned, bald head, not in any particular place. I don't know why I decided on that image.
Cthulhu is not even that badass.... he's only an Old One. The Outer Gods are much more "frightening."