The concept of 'design color images of a heavy feeling' refers to visual artwork that uses color schemes and imagery to convey a sense of weightiness, depth, or melancholy. This can be achieved through the use of darker, more muted color palettes, heavy textures, or symbolic elements that evoke a feeling of seriousness or somberness. In design, such imagery might be used in graphic design, photography, or digital art to create a mood or atmosphere that resonates with a specific theme or emotion.