Ravenloft has got its own serial-killer, the Midnight Slasher,
and the classic gothic horror is not the sole source of inspiration. A good example is the plant dopplegänger, based in the sci-fi horror movie "the invasion of the body-snatchers".
From 1990 a lots there have been many horror productions, good and evil, and even from a horrible serie-B title you could find ideas for your game. Even the werehare, the werebadger, the wereram, werebison, wereweasel and weresloth (from Dragon Magazone #40)could be useful. Stephen King could write a horror story about a laudry-machine, as example of ordinary objects becoming fearful menaces. Why not to recycle "bad ideas" to create anything that could be amazing? For example the weresloth used as a twisted and wicked version of the sleeping beauty. The weresloth is almost always sleeping (and in the nightmare realms a dangerous predator), used as a sentinel of a precious threasure (why not better an undead? because the tomb raiders has got ready with special ways against these, or the potential invader usually is a werebeast who eats undeads). Becoming a weresloth can be a humiliating curse but it is worse when you notice somebody wants to hunt because your claws hurt undead and werebeasts as the silver bullets, The regeneration of a were-prey are practically a penalty when your fate is being amputated time after time as source of food, and weapons crafted by your bones, or being eaten alive forever as the mythological giant Tytus. The manganime "the island of the giant insects" is a example of how "ordinary monsters" as the classic giant vermins can be more terrifying you could suposse at first.
And other thread is what if players want to play monsters as undead and theriantropes, when this was allowed in 3.5.
* Technically the gnolls are like complete tribes of slashers, and the jerren (evil halflings) is too capable of certain actions to cause fear and horror even other evil humanoids.
