Final answer:
The metaphor implies a situation where one is exposed to the elements and indicates a sense of vulnerability, simplicity, or connection with nature, often used to enhance the mood in literature.
Step-by-step explanation:
The metaphor "To where the Sky was their blanket and the cold Earth, their pillow" suggests a situation of being exposed to the elements, with the sky as the only cover and the ground as the only place to rest. This phrase likely conveys a sense of vulnerability, simplicity, or connection with nature. It can imply that one is in a predicament where no physical comforts are available, such as in homelessness or during a challenging outdoor journey. In literature, this metaphor may enhance the mood by emphasizing a character's loneliness, freedom, or survivalist state.