Photo Wall and Personalized Bottles Document a life and make a big, bold visual statement at the same time. It's a snap to do -- and inexpensive, too. Print photos in various sizes. Lay them on the floor in the shape of the birthday number to determine your arrangement. Then tape them to a wall. Attach more images to bottles with double-sided tape.
YES PLEASE Money Balloons - a cool way to present money as a gift, esp for a young person (as opposed to a boring check in a card). I have a friend whose parents blow up a balloon and put a one dollar bill in it and have the number of balloons for how old their kid is on their birthday and then after they open their presents they can pop open the balloon and get their $. very cute.
Put candy inside the balloons and have the kids throw darts. WAY WAY WAY better than a pinata