Prompt: \"Create a colorful and festive birthday cake with vibrant icing. The cake should be decorated with a variety of edible flowers, cheerful patterns, and bright sprinkles. On the top of the cake, in elegant and bold lettering, include the phrase 'Happy Birthday.' The cake should have multiple layers visible from the side, each layer having a different pastel color. The background should be simple and neutral to emphasize the cake's details.\"