This is such a fun project. The key to the success of the alien is the "lack of control" in tearing the paper! This gives a huge variety of alien faces!
What you will need: A 9 x 12 black paper to build your alien on, a 9 x 12 green paper to tear the head of the alien out of, assorted colors of paper for facial features, black paint and a few items to print with.
STEP ONE: Tear the green paper to create a head for your alien. Whatever shape you get is just RIGHT!
STEP TWO: Glue down the head shape to the black paper.
STEP THREE: Tear other colored papers to create eyes, nose, mouth, antennae, whatever!
STEP FOUR: Using black paint and a variety of items as stamps (I used a plastic cup, glue stick, etc) stamp features on your alien. Done!