Based on your requirements for a spreadsheet with inputs, titles, headings, and various data types, I have generated a cohesive color palette that enhances readability and usability.

 <Spreadsheet Color Theme>
1. Input Color - 
                            
                            #D1E7DD
                         - Soft Green for input fields, promoting a sense of calm and focus.
2. Title Color - 
                            
                            #0D6EFD
                         - Bright Blue for titles, conveying trust and professionalism.
3. Heading Color - 
                            
                            #FFC107
                         - Golden Yellow for headings, providing an eye-catching contrast and clarity.
4. Background Color - 
                            
                            #F8F9FA
                         - Light Gray for the background, ensuring content is easily readable without strain.
5. Text Color - 
                            
                            #212529
                         - Dark Charcoal for standard text, ensuring high contrast and legibility.

This palette creates a visually appealing and organized spreadsheet, where each element is easily distinguishable while maintaining a professional look.

Do you have specific preferences for any other elements, or would you like to explore additional colors for different data types?