This Adult Coloring Sea - Seashell coloring page shows an array of differently shaped shells, featuring spirals, ridges, and smooth curves. A variety of colors can be used to make these shells pop, such as tan, pink, brown, white, and purple. A touch of green seaweed or kelp can be added to create a more vibrant feel. To bring this image to life, use lighter shades near the top of the sandy bottom and darker colors to define the deeper depths. Finally, feel free to add splashes of bright colors for a festive, beach-like atmosphere.