create a whimsical underwater world: vibrant coral reefs and playful sea creatures

underwater ocean fish colorful cartoon playful aquatic vibrant seaweed nature coral sea bubbles adventure creatures reef environment marine life exploration vector fantasy friendship fun water jellyfish whimsical world wildlife cute mermaid children background aquarium tropical oceanic imagination design ecosystem fauna nerine starfish creature floor shells art graphic swimming scene octopus plants travel animals biology habitat pattern corals diver shoal create world: reefs