Answer:
I am the yellow hem of the sea's blue skirt.
This is needed both for courage and hardcover books.
At first I am a yellow weed in the lawn, and then the wind blows, and my white feathers are gone. What am I?
A slow, solemn square-dance of warriors feinting. One by one they fall, warriors fainting, thirty-two on sixty-four.
What hangs others yet can unintentionally hang itself?
I can only be played on a windy day