<Dark Theme Spreadsheet>
1. Deep Ocean - 
                            
                            #003B5C
                         - A rich, dark blue that provides a calming backdrop, enhancing readability.
2. Midnight Green - 
                            
                            #004B3D
                         - A deep green that conveys stability and tranquility, perfect for data-heavy environments.
3. Charcoal - 
                            
                            #333333
                         - A soft blackish-gray that reduces glare while ensuring white text pops for readability.
4. Twilight Purple - 
                            
                            #5D3A91
                         - A muted purple that adds a touch of creativity and sophistication without overwhelming the eyes.
5. Slate Blue - 
                            
                            #4A6071
                         - A cool, muted blue-gray that maintains a professional appearance while being easy on the eyes.

This color palette is designed for a dark-themed spreadsheet that promotes eye comfort while using white text. The colors are chosen to minimize strain and enhance clarity, making it suitable for long periods of use.

What specific application will this spreadsheet be used for? Would you like to adjust any colors based on personal preferences or branding guidelines?