Here’s a color palette based on the colors C8102E (a vibrant red) and 00253E (a deep blue) that would work well for an Excel theme:

json
{
  "palette_name": "Excel Theme Based on C8102E and 00253E",
  "colors": [
    {
      "name": "Vibrant Red",
      "hex_code": "
          
          #C8102E
       "
    },
    {
      "name": "Deep Blue",
      "hex_code": "
          
          #00253E
       "
    },
    {
      "name": "Bright White",
      "hex_code": "
          
          #FFFFFF
       "
    },
    {
      "name": "Soft Gray",
      "hex_code": "
          
          #F0F0F0
       "
    },
    {
      "name": "Light Red",
      "hex_code": "
          
          #FF4C4C
       "
    },
    {
      "name": "Sky Blue",
      "hex_code": "
          
          #007BFF
       "
    }
  ]
}

This palette combines the boldness of the red and blue with softer tones and neutrals to create a balanced and visually appealing theme suitable for Excel.

Would you like to know how to implement this color palette in Excel, or do you have any other preferences for colors?