Literal:
* The metalworker poured the molten silver into the melting pot to create a new design.
Figurative (referring to cultural blending):
* New York City is often called a melting pot of cultures, with people from all over the world coming together.
* The school's diversity program aims to create a melting pot of ideas and perspectives.
* Despite their differences, the two groups eventually found common ground and formed a melting pot of collaboration.
Figurative (referring to a blend of ingredients):
* The chef's secret ingredient was a unique blend of spices, creating a melting pot of flavor in the dish.
The best way to use "melting pot" will depend on the context of your writing.