Yes indeed, shades of gray colors exist in the fauna and flora world. The most common flowers with shades of gray colors are roses, agapanthus, alliums, irises, and lilies. The earl gray rose is a very rare and much sought-after flower that has a light green outer petal that blends into a very light lavender color. This gives off a gray hue as it spirals through to the center of the flower. Leaves with shades of gray colors are much more noticeable in the garden than actual flowers. The perennial gray-leafed Artemisia Stelleriana are plants that carry different shades of all gray colors.