Creating a color palette specifically for Excel’s THMX file type involves selecting colors that are typically used in Excel charts and tables. Here’s a color palette that you can use for a professional and modern look in Excel:

 <Excel Professional>
1. Primary Blue - 
                            
                            #0070C9
                         - A strong and vibrant blue for headers and highlights.
2. Light Blue - 
                            
                            #A3C5E0
                         - A softer blue for backgrounds or secondary elements.
3. Dark Gray - 
                            
                            #4B4B4D
                         - A neutral dark gray for text and borders.
4. Light Gray - 
                            
                            #D9D9D9
                         - A light gray for backgrounds and subtle elements.
5. Green - 
                            
                            #00B050
                         - A fresh green for positive indicators or highlights.
6. Orange - 
                            
                            #F6A600
                         - A warm orange for alerts or important highlights.
7. Red - 
                            
                            #E03C31
                         - A bold red for warnings or critical data points.

This palette provides a balance of vibrant colors and neutral tones, suitable for various data presentations while ensuring readability.

Would you like to know how to apply this palette in Excel or any specific design tips?