Its a box with no doors or openings, yet inside it holds the color of gold. WHat is it?
An egg. You sooo stole that from The Hobbit

This one is from the same place.

This thing all things devours:
Birds, beasts, trees, flowers;
Gnaws iron, bites steel;
Grinds hard stones to meal;
Slays king, ruins town,
And beats high mountain down.