Color Palette for an Iain M. Banks Space Opera Novel Cover:

1. Midnight Blue (
                            
                            #0B1A2B
                        ) - representing the vastness and mystery of space, this dark blue hue adds depth and intrigue to the palette.

2. Cosmic Purple (
                            
                            #5B0A91
                        ) - a bold and vibrant shade, this purple captures the otherworldly nature of the novel's setting and adds a touch of excitement.

3. Stellar Silver (
                            
                            #C0C0C0
                        ) - a metallic silver tone that adds a futuristic and technological feel to the palette.

4. Alien Green (
                            
                            #00FF7F
                        ) - a bright and lively green that represents the unknown and potentially dangerous extraterrestrial life that may be encountered in the novel.

5. Red Dwarf (
                            
                            #FF4500
                        ) - a fiery orange-red hue that evokes the intensity and danger of space travel, as well as the potential hazards and conflicts that may arise.

Overall, this color palette creates a sense of adventure, danger, and mystery, perfectly capturing the essence of an Iain M. Banks space opera novel.