I love the smell of lavender but I would also add some eucalyptus because it kills dust mites. Love the idea of saving money and Motherearthnews has just waht I need.
Love knowing there are no nasty chemicals going in to the laundry.
Make Your Own Lavender Laundry Detergent–for Pennies
http://www.motherearthnews.com/natural-home-living/make-your-own-lavender-laundry-detergent-for-pennies.aspx