How about these? Spoiler tagged for those who don't want to see them.
(http://micechat.com/forums/customavatars/avatar13261_8.gif)
(http://www.columbiacostumes.com/Images/Closeout%20Props/hook_face_plaque.jpg)
This one reminds me of Choke :shock: :
(http://www.spirithalloween.com/images/spirit/products/processed/00161653.detail.a.jpg)
(http://thumbs.dreamstime.com/thumb_1/1094269079xLPBi1.jpg)
(http://www.uksearchindex.com/ghost-1.jpg)
(http://www.photofurl.com/wp-content/uploads/2008/04/the_most_scary_face_of_the_world-230x300.jpg)
Have fun. :P
Eh, I guess I might as well post an idea I've had for a while. Here's a very, very scary Ghoul idea. I should warn you though, this can scar you for life...
You think you've seen the worst there is. You think you've seen all the Pokémon in Kanto. You've braved all eight gyms, you've beaten the league, you've struggled with the Japanese text, and the only thing left to do is to go catch Metwo in the Unknown Dungeon. Once you've reached the final floor, and a couple steps away from the water, you notice the wild Pokémon sequence starting up. "No problem", you think, "I can take this Rhydon." But you were wrong. Horribly wrong. For what attacked you wasn't a Rhydon. You've heard myths and legends about this monster, but those are just regarded as fairy tales. It mutters it's cry. As you stare in horror, it slowly walks up to you. You try to run, but your legs won't listen. Your life flashes before your eyes as it sucks out your soul with it's small eye. Your corpse lies there, with the exact same face it has.
That's right, the abomination I'm talking about is #40, it's...
Green Version Wigglytuff
(http://i264.photobucket.com/albums/ii172/Robbingjoe/OHGODWIGGLYTUFF.png)
This Ghoul has escaped the Unknown Dungeon, and now wanders the Forbidden Forest. It strikes fear into everything that sees it, even the Yurei feared it before her death. It moves slowly, very slowly through the forest, and petrifies it's targets with it's large eye, and slowly closes in. It can endure many hits, but if it gets hurt too much, then it will run away extremely quickly in a bright flash, releasing you from it's gaze. But it will come back faster. If you are unfortunate enough to not be able to hurt this thing before it closes in on you, then you and everyone else frozen will hear it's shrill cry, see it's horrible face as it flashes on your screen, and have your souls sucked out by it's small eye. Should you have enough skill to hit this Ghoul as it gets faster and faster, then it will utter it's awful cry once more, and sink down into the ground, vanquished.
While we are all coming up with these idea's, I thought the nightbringer from Dawn of War would be pretty cool to fight, he's not really a ghoul, he's an god in a metal body who is the embodiment of death.
He has a huge scythe and destroys you in a swift movement of his scythe. He also can blow you away from himself using an etheric tempest. He can also do low ranged damage with a black energy stream from his fingers. When he dies, (this is my idea), he releases an unholy black fire which is instant kill and expands a few meters in every direction. Here's a few pictures:
(http://www.geocities.com/eniteris/Nightbringer.Pencil.jpg)
(http://media.comicvine.com/uploads/1/18519/555937-fill_still_nightbringer_1__super.jpg)
(http://wh40k.lexicanum.com/mediawiki/images/thumb/a/ae/DC_Nightbringer.jpg/200px-DC_Nightbringer.jpg)
Yeah, it's not original, whoop de doo. I would just like to see this monstrosity put into doom and he is ghouly in a way, kind of.