A Golden Cloud

Theme: Light Clouds, Dark Clouds

A golden cloud:
 worth more than what's silver.
A light golden cloud:
 warmed with light only it could deliver.
A golden cloud:
 carried a sorrow that filled like a river.
A darkening cloud:
 couldn't unload like others.
A dark golden cloud:
 couldn't see a lining that's silver.
A very dark cloud:
 couldn't get what it once had delivered.
now, A regular cloud:
 weeps along, with the clouds that are silver.