Gradient blues are aesthetically pleasing color schemes that transition from one shade of blue to another. The 'color values' refer to the specific hexadecimal codes or RGB values assigned to each shade. These values can vary widely, depending on the desired effect, and are often chosen to create a harmonious and visually appealing gradient. Commonly used color values for gradient blues include #007bff (for a light blue) and #0000ff (for a dark blue), with various shades in between.