Directly associated with indigo:
* Indigo dye: The pigment itself.
* Indigo plant: The plant from which the dye is extracted.
* Indigo bunting: A beautiful bird with bright blue plumage, often described as indigo.
Things that are often described as indigo:
* Sky: The evening sky can often appear a deep indigo blue.
* Ocean: Deep ocean waters can also appear indigo in color.
* Flowers: Some flowers, like delphiniums and irises, have indigo shades.
* Fabric: Denim is a classic example of indigo-dyed fabric.
* Gemstones: Sapphires and amethysts can have indigo hues.
Metaphorically associated with indigo:
* Melancholy: Indigo is sometimes associated with sadness or introspection.
* Mystery: Indigo's deep, dark blue can evoke a sense of mystery or the unknown.
* Creativity: Indigo is a color often used in artistic expression, so it can be associated with creativity.
Remember, the association of a noun with the color indigo is often subjective and can vary depending on context and personal interpretation.