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.
From Real Simple: If you send money to nieces and nephews for birthdays, switch up the normal card with this clever idea. Put single bills or coins into balloons and inflate them slightly then fill a shipping box with the balloons and send it off. It will be inexpensive to ship, and plenty of fun to open.