Well, there's Pokemon: Lost Silver, Zelda: Ben Drowned, Trochotillomania, Squidward's Suicide... Oh, and two I know that's aren't exactly creepy pastas per se, but still - Annie96 is Typing and the Dionaea House.

Jeff the killer i've always found pretty creepy, and the origins of laughing jack are pretty messed up!

ezequiel https://www.youtube.com/watch?v=BoE5pAlAoH8
Mr Widemouth https://www.youtube.com/watch?v=ZJxB5wAOk1Q

FunnyMouth, Abandoned by Disney, Squidward's Suicide, The Red Mist, WobbleWorld, Normal Porn for Normal People, and The Cleansing are all really good pastas. ovo

If you want to actually hear a bunch of them told well.. Look up MrCreepypasta or CreepsMcpasta on youtube....

They've each done various ones rather well.. Hearing them gives you a new perspective...

THIS one has stuck with me as one of the more disturbing that I have ever read:
http://www.reddit.com/r/nosleep/com...../the_basement/

And you could potentially get some creepy imagery out of this:
http://creepypasta.wikia.com/wiki/A....._Goatman_Story

Beyond that it might be fun to see your take on a few popular ones like Smiledog and Slenderman.

I was actually thinking about smile dog.
Id love to draw something fucked up lookin XD