Puffy Icing
This pattern is similar to the popcorn stitch.
Form an adjustable ring. Ch 3 (counts as first dc).
Then,
1. yarn over
2. insert hook in ring
3. yarn over
4. draw loop through ring
5. yarn over and draw loop through first 2 loops on hook
Do steps 1-5 5x.*
6. yarn over and pull through all 6 loops.
One puff made.

Next, ch 4,
7. yarn over
8. insert hook in first stitch
9. yarn over
10. draw loop through stitch
11. yarn over and draw loop through first 2 loops on hook
Do steps 7-11 5x.*
12. yarn over and pull through all 6 loops.
Second puff made.

Continue steps 7-12 until desired length. 

* You can alter the size of the puff by decreasing or increasing the repetition of steps 1-5 and 7-11.