For the Halloween season (hasn't started yet, but we need to do things early for the next list).
Top 50 Examples of nightmare fuel (expect a lot of clown-based horrors)
Top 50 Body Parts
Top 50 Scary/Halloween-themed TV episodes
Top 50 Frankensteins/Patchwork Men
Top 50 Halloween Costumes (or costume ideas)
Top 50 Monster Movies
Top 50 Scariest Movie Moments
Top 50 Treats and Tricks (Can include non-edibles like pennies and comics! Also, maybe include Halloween tricks, though I don't actually support them in anyways. But it does add variety and makes the title neater)
Top 50 Zombies/Zombie Hordes (includes individuals and groups from movies. Doesn't just have to be Romero style)
Top 50 Horror Writers (from all mediums)
Top 50 Devils and Demons (can include multiple interpretations of Satan)
Top 50 Personal Fears (wait are you afraid of. Spiders? Heights? Public Speaking? Of course, this one might make some uncomfortable, but I think it's neat)
Top 50 Vampires