Before I adhered the balloons to my soft grey card (Papertrey Ink), I blended a little Tumbled glass DI around the edges and tied some embroidery thread at the base of each balloon. I foam mounted the largest balloon as well as the sentiment strip (Label love, Altenew).
AAA Cards - #95 Rainbow
CASology - #259 Balloons for CASology's 5th Anniversary
Seize the Birthday - Birthday with the option of Splatter
ATSM - #252 Make your mark
HLS - Anything goes with dies