I'll say it right off the bat – balloons and weddings don't mix. In my opinion, an arch covered in balloons or balloons hovering over a reception table brings a wedding to the level of a kiddie's birthday party or into the realms of Fred & Edna's Trailer Park.
However…large balloons in the right hands can create an amazing space. We recently had a number of 3-foot diameter white balloons floating on top of the water at a pool to create a chic environ. They look great but are super affordable . Check out this photo from another event that featured this oh-so-fab-yet-oh-so-affordable (and easy -just make sure you have a compressor to blow them up):