I may be an old hippie but I don't go too crazy about everything being "natural" or chemical free. One thing I have steered clear of is fabric softener and dryer sheets. I have asthma and they just have too much scent! Here are some very easy directions to make your own dryer balls. I like the idea of using old wool sweaters to make them. Have a look here and get a few going as an after school project with your kids or during a movie in the evening!