* To describe a feeling of sadness or depression: "After the breakup, she was feeling the blues."
* To refer to a musical genre: "The band played a mix of blues and rock and roll."
* To describe a color: "The artist painted the sky with shades of blue."
* To describe a particular kind of denim: "He wore his favorite pair of blue jeans."
Let me know if you'd like more examples or have a specific context in mind!