This is popular on Buzzfeed, so perhaps it will be here, too. I don't want to clutter up the thread, so I'll just post my favorites (there are 34 total).
What Lurks Beneath The Waves: Pics, Videos, Links, News
Tyranx of conceptart.org
It's just so over the top. Supposedly it's the monster that dwells in the Bermuda Triangle.
I think he's happy to see me.