7 idioms derived from colours:
1. Pink Slip - dismiss (someone) from employment.
Example: He has been given a pink slip.
2. Black out - faint
Example: I black out when I stand under the sun for too long.
3. Golden opportunity - A very good chance to achieve something.
Example: She missed a golden opportunity to perform at the event.
4. Have the blues - Be sad or depressed
Example: I always have the blues during the winter time.
5. Once in a blue moon - Very rarely
Example: I get to meet her once in a blue moon.
6. White lie - an innocent lie to protect another person's feelings
Example: He was telling a white lie because he knew she would get hurt.
7. With flying colors - with distinction
Example: She passed the test with flying colors.