I used acetate strips & used small balloon punch from Fiskars for individual balloons to pop up from center of card. Same idea, different way to go about it. Used ScorPal tape to secure inner folds because ATG wasn't holding very well.
The design is for a birthday invitation, but it's a great idea for a launch party invitation! Encourage your guests to bring their balloons. They can double as a party game if you put little messages inside of them!