This coral-and-teal watercolor birthday invitation puts a smiling octopus at the heart of a soft ocean scene, lettered with the playful headline Sea You There for a three-year-old's beach celebration. The palette is pure tide pool: coral peach for the octopus and the honoree's script name, teal blue for the numerals and event details, powder blue for the bubbles and foam, with a touch of thistle purple in the seashell shadows. The guest page carries the same sun-warmed watercolor world — the invitation hangs in a seafoam mat cut like a punched day pass, complete with a hanging Sunfish Day Pass stub and an octopus peeking up from the corner with gently swaying tentacles. Rising bubbles, soft light rays, drifting sand sparks and swaying seaweed keep the page alive behind frosted cream panels, and the countdown runs as one joined admit-one strip. The RSVP closes the page on its most theatrical note: a deep-ocean panel where a drawn wave rolls above the reply button and the octopus mascot holds the stage. It suits a third birthday, a beach or poolside party, an under-the-sea themed celebration, or any toddler who loves the ocean — and every detail row, from the date and time to the venue, attire and parking, hydrates automatically with the host's own event information.