Craft a grayscale tattoo design featuring an hourglass as the central motif, imbued with artistic depth and texture. Avoiding geometric precision and fine lining, explore organic forms and textures to create a sense of rustic elegance. Incorporate subtle shading and bold strokes to emphasize the contours and details of the hourglass, while surrounding it with intricate filler elements such as swirling smoke, delicate foliage, or weathered textures. Aim for a composition that evokes a timeless yet rugged aesthetic, capturing the essence of the passage of time with a touch of raw beauty."