Brick Happy Birthday Balloon Decoration Kit Get ready to build the perfect party when you buy your party supplies from this LEGO Party theme that's great for a young boy's birthday. We promise that you won't get anywhere without some of these great party supplies. Balloons are a staple at parties, and this shiny and colorful foil balloon will make a bold statement in your party rooms. Please note that balloons do not ship inflated. You can have your balloon filled with helium at most supermarkets, florists, and party supply stores.