You can't go wrong with space kraken. I've only ever seen two in my lifetime. One was the steed of Mon*Star, the most badass 80s cartoon villain of them all.
The other is this one, made out of LEGO by builder Iain Heath, that would make people whimper "that's no moon....it's a space-faring giant squid".
And huge it would be. That looks like an Executor-class Star Destroyer it's got in its tentacles, which at 19km long would make the kraken....very large.