A 'cold color scheme' typically refers to a color palette that includes blue, purple, and green tones, which are often associated with calmness, serenity, and a sense of distance. Such color schemes are commonly used in photography and graphic design to evoke specific moods or emotions. A 'collection of pictures with cold color schemes' would be an assembly of images that primarily utilize these hues to create a cohesive visual theme. This could be for artistic, commercial, or personal projects, and might be used in various contexts such as advertising, web design, or interior decoration.