What does sustainability mean to actress Rosario Dawson? Or musician Florence Welch? Each star answered that question by designing the packaging on Kiehl's Deep Pore Cleansing Masque, its latest eco-minded beauty product. (The answer: a heart-shaped Earth for Florence and a rocky mountain for Rosario.) The masque will be available online at kiehls.com and in stores April 3rd—just in time for Earth Day!—with all proceeds benefiting Recycle Across America. Click through the gallery to see more celebrities who donated their creativity for the project.