Conventions of an Horror Movie

Conventional Colours:

• Black(Dark
• Red(Bloods)
• Grey(Foggy,Smoke)

Conventional Locations:

• Old style town
• Dark cave
• Dark location
• Night time
• Old abandon town
• Country side
• Cemetery 

Conventional Costumes:

• Old Clothes
• Dirty clothes

Conventional Actors:

• Freddy Krueger

Conventional Props:

• Knives
• Blades
• Guns

Conventional Characters:

• Evil man/woman
• Dead people
• Murderer

Example of films in this genre:

• Blazing 
• Dracula
• Demons
• Vampires
• Haunted House

Here is some picture of horror films:
   The Ring(2002)