Here is the updated color palette with one accent color added, while still keeping the overall subdued and professional look suitable for an Excel chart:

json
{
  "palette_name": "Subtle Earth Tones with Accent",
  "colors": [
    {
      "name": "Muted Sage",
      "hex_code": "
                            
                            #B7C9A5
                        "
    },
    {
      "name": "Sage Green",
      "hex_code": "
                            
                            #A3BFAF
                        "
    },
    {
      "name": "Dusty Blue",
      "hex_code": "
                            
                            #A3B7C9
                        "
    },
    {
      "name": "Soft Blue",
      "hex_code": "
                            
                            #8DA3B7
                        "
    },
    {
      "name": "Warm Gray",
      "hex_code": "
                            
                            #B0B3B8
                        "
    },
    {
      "name": "Light Gray",
      "hex_code": "
                            
                            #D1D3D4
                        "
    },
    {
      "name": "Muted Brick",
      "hex_code": "
                            
                            #C84A3D
                        "
    },
    {
      "name": "Soft Brick",
      "hex_code": "
                            
                            #D67F6D
                        "
    },
    {
      "name": "Accent Olive",
      "hex_code": "
                            
                            #7D8B2A
                        "
    }
  ]
}

This palette, “Subtle Earth Tones with Accent,” includes an olive green accent color that can be used to highlight important data points or sections in your Excel chart, adding a touch of vibrancy while still maintaining a professional look.

Would you like suggestions on how to best utilize the accent color in your chart?