For details on my initial Scream-In Program please see the TTR chapter I wrote in 2011.
2012 Ideas Are:
Black Oil-Based Paint Pens
Black Puff Paint
Small/Medium White Pumpkins
Directions: Use paint pens and puff paint to create spooky shadows on small to medium-sized pumpkins. Print some examples of "spooky eyes", spiders, witches and black cats from the Internet.
Cupcakes without icing (If you don't feel like baking, talk to your local grocery store)
Red Gel Icing (lots)
Give each teen at least one cupcake, a knife and a plate. Have teens ice cupcakes and decorate with sprinkles. Then give each teen a tube of the red gel icing and let them go to town. They can stick the tip of the tubes into the cupcakes to add "blood" inside the cupcake and decorate the outside.