Answer:
In the forest, this blends in just right, but every December it is covered with lights. What is it?
I am black when I am clean and white when I am dirty?
What is given but kept by the giver?
Which word contains 26 letters but only three syllables?
They can be harbored, but few hold water. You can nurse them, but only by holding them against someone else. You can carry them, but not with your arms. You can bury them, but not in the earth.
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.