As a child, I had numerous, extremely vivid nightmares. I would mention them once in awhile to my parents. I actually still have some today; sometimes they have the ability to disturb me during the rest of the day after waking up, though I don't mention them as often now. It's something I've come to terms with and just accepted as 'normal' for me. These are some monsters I developed off of a mixture of a nightmare and too many episodes of the Discovery Channel's Blue Planet. On the side, you can find some directions I scribbled for myself during work!
I think it's actually quite a task to draw a 'scary' monster! I had an assignment back in the earlier years of college in a Character Development class to do just that. There were perhaps one or two out of the entire class that could have been defined as something that would bring terror.
As for these... well, I spend 5 hours a day commuting back and forth from NYC so I have many, many, many images of people... on a train. Here's a few of them. There are some character designs are in there from when I was developing the face for the 'Belle' comic as well as other random odditites. Enjoy!