2. Samara

Samara from the movie The Ring is one of the creepiest females in horror. The Ring terrified audiences when it came out and you can scare everyone at your Halloween party by going as the girl from the well. Her outfit is simple and easily something you could make yourself. All you would need to purchase is a long black wig. Visit coolest-homemade-costumes.com for a great tutorial on how you can make the look yourself.