Awesome idea:birthday party decor,take diffrent color table cloths and tape them to to ceiling like that. Then tie 3 diffrent color balloons together and tape them to another set of balloons then tape the all the balloons in the middle of the table cloth.
I would love to see a tent filled with a "forest" of helium balloons attached to funky strings such as these. Kids would love it! (Blowing Up: 25 Easy, Inexpensive, and Totally Unexpected Ways to Use A Balloon)