Let's create a whimsical birthday-themed illustration showing a creative scene. Imagine a steam train going through a tunnel that resembles a large biscuit, with cartoonish underwater explorers peeking out of the windows, musical instruments at the ready as if preparing for a celebration. Behind the train, a black cat wears a festive hat and rides a scooter, adding a charming sense of mischief to the scene. Above everything else, a banner proclaims 'Happy Birthday!' with various biscuit types hung as unconventional decorations, enhancing the scene's fun atmosphere.

Generated with these themes: Steam trains, Octonauts, Guitars, Biscuits, Scooter, and Black cat .

Made with ❤️ by AI.