"Create a delightful black-and-white illustration for a children’s coloring book, tailored for ages 3-5, depicting a group of unicorns celebrating a birthday party. Use bold, thick lines to ensure ease of coloring for young children. Picture the unicorns gathered around a festive table adorned with balloons, streamers, and a big birthday cake with simple decorations like stars and flowers. The unicorns should wear party hats and have excited expressions on their faces. Include basic party activities such as blowing out candles, playing musical chairs, or opening presents. Keep the background simple yet cheerful, with a few more balloons floating in the sky and maybe some confetti scattered around. This scene aims to capture the joy and excitement of a magical birthday celebration, inviting children to color and bring the party to life with their imagination