Zigzag puffs are perfect for filling in large areas. You can also use this technique to achieve clouds or smoke.
Buttercream icing medium consistency
Fit the decorating bag with Open Star Decorating Tip 17 and fill 1/2 full with medium consistency icing. Hold the bag at a 45° angle at 3:00. Hold the tip lightly touching the surface. Begin to pipe with a light pressure, then use heavier pressure toward the center of the puff, then return gradually to a light pressure to form the tapered end.
To end each puff, stop pressure and pull away.
Repeat as you move in a straight line to form a row of puffs.