Twelve colorful sea slugs float across a black background in a grid arrangement, each creature rendered with jewel-toned hues of purple, blue, pink, yellow, and coral. The illustration style is playful and organic, with flowing tentacles and ridged bodies that capture the whimsical character of these marine animals. Printed on smooth white card stock and made to order, artwork on the front, blank inside, envelopes included in every set. A handwritten note that arrives as an independent artist's work.