I have been experimenting a bit with various plant dyes. I try to reuse the dye baths several times until the dye is fully exhausted. The variations that you can get in colour are amazing, depending on the strength of the dye bath, the acidity of the water, the temperature of the dyebath and how long you leave the item to soak in the dye bath.
Here is a photo gallery of cotton tote bags that have been dyed with plants.
Please visit my Spin Flora shop on Etsy for the latest selection of plant dyed tote bags.