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

json
{
  "palette_name": "Subtle Earth Tones with Fresh 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 Terracotta",
      "hex_code": "
                            
                            #C15A3D
                        "
    }
  ]
}

This palette, “Subtle Earth Tones with Fresh Accent,” features a terracotta accent color that provides a warm and inviting touch, ideal for emphasizing important data points in your Excel chart while maintaining a professional appearance.

Do you have specific ideas on how you want to use this accent color, or would you like tips on integrating it into your chart design?