I'm a bit tired of doing image posts lately, so here's a random video embed of a clip from a kaiju movie that features a giant space jellyfish.
While the person who posted the video was rather derisive of it, I quite liked it, not least because the monster, which was apparently "animated" primarily with a puppet that was underwater, actually looks quite eerie and interesting.
Never mind that the filmmakers had it need a diet of carbon to justify it attacking places to devour diamonds. (There are lots of better sources of carbon in the world, guys, not least because diamonds would be much harder to digest than most of them. Heck, if you want carbon so bad, do what plants do and take it out of the air.)