Fill the 5" with helium and tie and trim the neck as in step 3. Keep adding and filling 5" balloons until the big balloon has five or more balloons in it.Sharing the easiest DIY for your next birthday. Here is how to make a big foam marquee number that will be a hit at your next party. Completion of the ICAO flight plan form is quite simple and is only a matter of inserting the requested information in the appropriate boxes. Music Note Balloon Sculpture.