A 3 foot black balloon (or black with question marks printed on it) contains lots of confetti in your chosen colour theme which is usually pink or blue but it can be any colour you like (a football team colour for example).
The balloon is decorated with a bow and attached to a foil weight which is also decorated with a bow.
Or how about a balloon in a box? We can use a gender neutral bow and ribbon on the box so what's contained inside is a surprise. The links to order a Balloon in a Box Gender Reveal are listed below.