Instructables
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Bio-plastic is a simple project that can be done in a matter of hours with household objects
 
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Step 1: Materials List

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Tools needed:
-Hot plate/stove
-Cooking pot (a non-stick surface works best)
-Silicon spatula
-Non-stick silicon mat or aluminum foil
-Tablespoon
-Teaspoon
*Graduated cylinder (at least 100ml)  
*Beaker (any size above 500ml)

Ingredients:
-Liquid vegetable glycerin
-White vinegar
-Distilled water
-Vegetable starch for example potato, or corn starch (Tapioca starch works the best)

*Optional

Step 2: Measure out Ingrediants

To begin the procedure you must:

1) Measure out 1 tablespoon on starch into the pot. 
2) Measure out 4 tablespoons of water into the pot. 
3) Measure out a teaspoon of vegetable glycerin into the pot. 
4) Measure out a teaspoon of white vinegar into the pot.
   

Step 3: Mix and Turn on Heat

5) Mix all of the ingredients inside of the pot until color and consistency are the same. This should be a white, glue like thick liquid/paste.
6) Place the pot on the stove top/ heat plate and turn it on low. Once the heat is on DO NOT stop stirring until the heat is turned off.
7) keep on stirring the matter. It should turn into a clear gel.
8) Turn off heat once it is completely clear and there are small bubbles. You can stop stirring now.       

Step 4: Finish

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9) Spread out your silicon mat or aluminum foil
10) Pour the gel onto the silicon mat or aluminum foil
11) Leave this in a dry place (inside) for about 24 hours

Your finished product should be 

Step 5: Getting Fancy

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I did not do this but if you want you can make your own molds and make more complex structures with your bio-plastic.
Here is an instuctables on how to make molds:  
http://www.instructables.com/id/Two-Part-Silicone-Casting/
It's a good idea but someone did an 'ible' on this a while before you...
http://www.instructables.com/id/Easy-Biodegradable-Plastic/