A cheerful yellow submarine floats against a deep navy blue background, its rounded hull rendered in bright gold with red circular windows and a yellow periscope crowned with a heart-topped antenna. Above the vessel, a trail of red bubbles drifts upward in a gentle arc, creating a whimsical sense of motion and playfulness against the solid dark backdrop. 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.