Create a realistic background illustration for holidays and events with a highlighted blank text box for later input. The image should feature a birthday invitation theme, including festive elements such as balloons, confetti, cakes, and party hats. The design should be vibrant, colorful, and visually appealing, capturing the joyous and festive atmosphere of a birthday party. The blank text box should be prominently displayed in the center, ready to be filled in with personalized birthday invitation details. The overall illustration should convey a sense of excitement and anticipation, perfect for celebrating a birthday. Make sure the background is versatile and suitable for printing on invitations or cards.