There are many ideas that you can use for making your Hallowe’en a little spooky. Check this post on expressnightout: Drinks Chilled, or Chilling
Now use your imagination.
Liquorice and red make a spooky combo
Any combination of orange and black
Using Kahlua and blood oranges
Using partly peeled radishes and olives to make scary eyeballs
Put some dry ice in the punch bowl
Bloody Brain Shooters – Recipes for this and others
Pumpkin Ice Buckets
Pumpkin Punch Bowls
If you can get Black Vodka, there’s no end of Creepy Cocktails you can make.