Here is a soft neutral palette with gray tones that are easy to differentiate, suitable for use in Excel:

json
{
  "palette_name": "Soft Neutral Gray Palette",
  "colors": [
    {
      "name": "Light Gray",
      "hex_code": "
          
          #D3D3D3
       "
    },
    {
      "name": "Silver Gray",
      "hex_code": "
          
          #C0C0C0
       "
    },
    {
      "name": "Gray",
      "hex_code": "
          
          #808080
       "
    },
    {
      "name": "Dim Gray",
      "hex_code": "
          
          #696969
       "
    },
    {
      "name": "Slate Gray",
      "hex_code": "
          
          #708090
       "
    },
    {
      "name": "Dark Slate Gray",
      "hex_code": "
          
          #2F4F4F
       "
    },
    {
      "name": "Light Slate Gray",
      "hex_code": "
          
          #778899
       "
    },
    {
      "name": "Gainsboro",
      "hex_code": "
          
          #DCDCDC
       "
    },
    {
      "name": "Ash Gray",
      "hex_code": "
          
          #B2B2B2
       "
    },
    {
      "name": "Charcoal Gray",
      "hex_code": "
          
          #36454F
       "
    },
    {
      "name": "Cloud Gray",
      "hex_code": "
          
          #A9A9A9
       "
    },
    {
      "name": "Pewter Gray",
      "hex_code": "
          
          #8C8C8C
       "
    },
    {
      "name": "Stone Gray",
      "hex_code": "
          
          #7D7F7D
       "
    },
    {
      "name": "Fog Gray",
      "hex_code": "
          
          #B7B7B7
       "
    },
    {
      "name": "Smoke Gray",
      "hex_code": "
          
          #A0A0A0
       "
    },
    {
      "name": "Mist Gray",
      "hex_code": "
          
          #C8C8C8
       "
    },
    {
      "name": "Titanium Gray",
      "hex_code": "
          
          #B7B7B7
       "
    },
    {
      "name": "Graphite Gray",
      "hex_code": "
          
          #3B3B3B
       "
    },
    {
      "name": "Warm Gray",
      "hex_code": "
          
          #A89F91
       "
    },
    {
      "name": "Cool Gray",
      "hex_code": "
          
          #B7B9B8
       "
    },
    {
      "name": "Frost Gray",
      "hex_code": "
          
          #E0E0E0
       "
    },
    {
      "name": "Cinder Gray",
      "hex_code": "
          
          #4A4A4A
       "
    },
    {
      "name": "Shadow Gray",
      "hex_code": "
          
          #B6B3A8
       "
    },
    {
      "name": "Cement Gray",
      "hex_code": "
          
          #AFAFAF
       "
    },
    {
      "name": "Smoke White",
      "hex_code": "
          
          #F5F5F5
       "
    },
    {
      "name": "Iron Gray",
      "hex_code": "
          
          #5B5B5B
       "
    },
    {
      "name": "Pale Gray",
      "hex_code": "
          
          #EAEAEA
       "
    }
  ]
}

This palette features 25 distinct shades of gray that are soft and neutral, ensuring easy differentiation in Excel. Would you like assistance with anything else, such as applying these colors in a specific context or format?