Answer:
It is sometimes known to have silver linings.
I fly through the air on small feathered wings, seeking out life and destroying all things.
He stands beside the road. In a purple cap at tattered green cloak. Those who touch him, curse him.
Take one out and scratch my head I am now black but once was red.
Neither bought nor sold but more valuable than gold. It is built but not by hand. What is it?
You use it between your head and your toes, the more it works the thinner it grows.