You can do an experiment on how biofuels are produced. It is a very up-to-date topic, and its not hard to do the experiment. You can make ethanol out of corn, or sugar cane. Or hell, any starch containing substance, I used conkers for my project. If you have the proper materials, it should take only 2-3 days to do this.
http://bioweb.sungrant.org/Technical...on/Default.htm
Check that site out. I can help you out with anything if you decide to do this.