Use your oldest clothes & Jacket.
Green makeup (free recipe below).

1. You will need to make some green & black makeup from the recipe at the bottom of the main costume page. Thee recipe is made with things you may already have in your home.

2. Apply green makeup to entire face. Than put black makeup around the eyes being very careful not to get makeup in your eyes.

3. Wear old dark clothes, and if you have one, and old dark colored jacket.

4. You could walk around with your arms extended straight out and make grunting noises for special effects. No need to do this all night though!