<Unified Light Contrast Palette for Google Sheets>
1. Soft Sky Blue - 
                            
                            #A4D7E1
                         - A gentle blue that maintains a light ambiance while contrasting well with dark text.
2. Sky Blue - 
                            
                            #BEE3F8
                         - A balanced blue, ideal for headers or emphasis without being overwhelming.
3. Muted Sky Blue - 
                            
                            #7FB4D7
                         - A slightly darker blue that remains soft and readable.

4. Soft Green - 
                            
                            #B2E0B2
                         - A fresh, light green that offers a calm and organized feel for data presentation.
5. Light Mint - 
                            
                            #D1F7D1
                         - An even lighter green perfect for background areas and subtle distinctions.
6. Muted Green - 
                            
                            #8FCB8F
                         - A more subdued green that retains clarity without being too dark.

7. Warm Coral - 
                            
                            #FFB3B3
                         - A soft coral that adds warmth and is inviting while being easy to read.
8. Light Coral - 
                            
                            #FFCCCC
                         - A lighter version of coral that works well for highlights and gentle emphasis.
9. Muted Coral - 
                            
                            #FF7A7A
                         - A moderate coral that still stands out without being harsh.

10. Soft Lavender - 
                            
                            #E6E6FA
                         - A light lavender that offers a delicate touch to the overall palette.
11. Light Lavender - 
                            
                            #F3E8FF
                         - A very light lavender perfect for subtle background applications.
12. Muted Lavender - 
                            
                            #D1C6E7
                         - A more subdued lavender that provides contrast without harshness.

This unified color palette aims for a softer contrast that remains readable while providing a consistent and harmonious aesthetic. The colors are designed to be gentle on the eyes, making them suitable for long periods of use in Google Sheets.

Would you like to adjust any specific colors further, or do you want to explore how to implement this palette effectively?