Blue. Serenity, sincerity, stability, reliability, and productivity.

Blue blood, Blue moon, Blue-eyed, Blue note, Blue movie.

Red. Energy, passion, power, action, confidence, dominance. 

Red mist, Red light, Red-handed, Red tape. 

Yellow. Happiness, optimism, creativity, intellect, enthusiasm, joy.

Yellow light, Yellow state, Yellow-bellied, Yellow dog.

Purple. Spirituality, imagination, royalty, mystery, wisdom, arrogance.

Purple you, Purple prose, Purple patch.

Green. Harmony, growth, freshness, energy, prosperity, safety.

Greenlight, Green thumb, Green fingers.

Pink. Affection, friendship, availability, love, inner peace, sweet.

Pink elephant, Pink slip, In the Pink.