Dead Alien - Halloween prop

Step 5 Create intestines

Carve out several ribs and the stomach area. By arching the back and seperating them a little, it expands the torso length of the skeleton, making your alien "taller". I also reversed the pelvis of the skeleton and cut a section out of the new "front" to change the anatomy of the creature.
Put on your rubber gloves and make sure that you are wearing some old or protective clothing as we start to get messy...
Shake your can of expanding spray foam. If you are not familiar with this product, it is a can that contains a liquid version of a urathane product. When you press the nozzle, the foam comes out and down a tube where it proceeds to expand to many times it's original size and is used to stop the airflow around windows, doors, cracks, etc. The key to using it for halloween is the speed of application - if you keep the nozzle in one area or slowly move it, you end up with a blob or a filled area. If you move it quicker, you end up with intestine-looking blobs, and if you move it quickly you end up with smaller intestine-looking blobs. See where I'm going with this?
My alien has some intestines coming out of the torso that we opened up earlier. In the upper area fill using a slower moving motion, and then as you get towards the lower area start to build up with faster moving strokes. Stop occasionally for a few minutes to let the foam expand, and then add some more smaller intestines, maybe even hanging some over the edge...
I've also added some in the pelvis to increase the stability. It did help.