Even moderate winds can affect what kinds of balloon décor can work outdoors. In decorating the Hunterdon County Arboretum gazebo for a birthday on a windy day I limited the decorations to daisy clusters tied to trees, posts and fencing. I also tied a balloon column to a stair railing.
Pastel colors were desired and this lent itself well to the use of balloon daisy clusters. On those clusters I alternated the center balloons between solid white and polkadot prints in pink, purple and clear balloons.