Beyond the sign's structure, I immediately thought of pom poms, and I thought it might be fun to share my method. It's quite simple, really.
Gather your materials. I chose four types of organza ribbon, while cream tulle served to provide the loft and bulk I needed. You'll likely need only scissors in addition to the ribbon and tulle. (I also bought three cowbells and a bunch of jingle bells to intersperse. The sound as they drove away was the epitome of celebration, but that's just my take!)
Begin by clutching the tulle in-hand, gathering from the center of the material. Be sure to pinch from the center as you go along, as this will give you the roundest and most symmetrical pom pom. Insert your ribbons at a ratio of four to five wrinkles of tulle per ribbon. There's no real formula--just what you think will look best.
Keep this up until your fist is full of ribbon and tulle. If you're about to drop it while you're trimming the tulle, your pom pom is well on its way to perfection.
Next grab a similarly colored pipe cleaner, and wrap it at the center of your folds. Quickly bind all your hard work with the pipe cleaner. Twist, twist.
Finally, fluff by pulling ONLY the tulle in opposite directions, taking care to work the circumference of the pom pom. Essentially, you're teasing the pom pom like you once did your bad, bad 80's bangs. (If you tug at the ribbons, they'll come loose. Leave them alone.)