I want the cover to be playful and natural. I prefer a brown cover (poop reminder or something very natural like parchment or sand color or wood color with images of the pH color scale. I think each little rectacle of the color scale could turn into an "outhouse" door of sorts. I think it needs to be clear that pH relates to pH and oop relates to poop and that phoop is not pronounced foop. pHoop...(poop) a holistic approach to daily cleansing.