Creating an Excel theme file requires specific formatting and a structured approach that is not directly possible in this text format. However, I can guide you on how to create an Excel theme using the color palette provided.

Steps to Create an Excel Theme:

1. Open Excel: Start a new workbook.

2. Access the Page Layout Tab: Click on the “Page Layout” tab in the ribbon.

3. Colors:
   • Click on the “Colors” drop-down menu in the “Themes” group.
   • Select “Customize Colors.”
4. Set Your Colors:
   • Background: Set the “Background 1” color to #0D5257 .
   • Text Color: Set the “Text/Background 1” color to #F8F6EF .
   • Accent 1: Set to #FF812A .
   • Accent 2: Set to #71DBD4 .
   • Accent 3: Set to #FEDB00 .
   • You can leave the other colors as default or customize them as well.

5. Name Your Theme: After setting the colors, give your new theme a name and click “Save.”

6. Save the Theme: You can save the theme in Excel for future use. Click on the “Themes” drop-down menu again, and select “Save Current Theme.”

7. File Format: Save your Excel file as an .xltx template if you’d like to use it as a template for future projects.

Note:

Unfortunately, I cannot generate a downloadable Excel theme file directly, but following these steps will allow you to create a custom theme in Excel based on the color palette we developed.

If you need further customization or guidance on any specific features, feel free to ask!