A birthday or anniversary # envelope surprise. Put the envelopes in the number of the year of the birthday or year of anniversary. Then add notes or things get can get for them in the envelopes! Doing this for my Husbands and sons next birthday!
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!