Here’s a color palette inspired by your request for heritage navy, gold, white, grey, and black, with a focus on a muted mustard gold and navy.

json
{
  "palette_name": "Muted Heritage Elegance",
  "colors": [
    {
      "name": "Heritage Navy",
      "hex_code": "
          
          #001F3F
       "
    },
    {
      "name": "Muted Mustard Gold",
      "hex_code": "
          
          #D6A93A
       "
    },
    {
      "name": "White",
      "hex_code": "
          
          #FFFFFF
       "
    },
    {
      "name": "Grey",
      "hex_code": "
          
          #A9A9A9
       "
    },
    {
      "name": "Black",
      "hex_code": "
          
          #000000
       "
    }
  ]
}

This palette combines rich navy and a soft, muted mustard gold, balanced with classic white, grey, and black for a sophisticated and versatile Excel theme.

Would you like to know how to apply this palette in Excel, or do you have any other specific requests?