Create a festive nail design that captures the joy and excitement of a birthday celebration. Incorporate vibrant colors, such as blues and pinks, symbolizing balloons and confetti, paired with subtle metallic accents to mimic party decorations. Experiment with colorful glitter on one or two accent nails, resembling a cascade of sprinkles on a birthday cake. Let one nail feature a tiny hand-painted candle with a soft, glowing flame to make a wish upon. Balance the playfulness with a touch of elegance, ensuring it is suitable for any birthday setting, from a casual gathering to a grand soirée.