Sad colors
The phrase "feeling blue" means feeling sad or depressed. This idea comes from old sailing traditions where blue flags were used when someone died during a voyage.
Artists, like Pablo Picasso, used blue to show sorrow and hardship. During his Blue Period, Picasso painted mostly in blue shades, depicting themes of poverty and loneliness. His works, such as The Old Guitarist, are examples of how blue can express deep sadness.
Since blue is a cool color, it can create a calm, still feeling that sometimes feels cold or distant. This can make people feel lonely or sad. Keep in mind that different shades of blue have different connotations. For example, light blue can be calming and serene, while dark blue can feel more somber.
Gray is another color linked to gloominess and a lack of energy. It can evoke feelings of dullness and depression, especially when used in large amounts.
Pro Tip: Avoid using pale, low-saturated blue or gray for CTA buttons.