Here’s a color palette that is suitable for a nice and professional Excel presentation, featuring soft and muted tones that are not overpowering:

json
{
  "palette_name": "Professional Excel Palette",
  "colors": [
    {
      "name": "Soft Blue",
      "hex_code": "
                            
                            #A7C6ED
                        "
    },
    {
      "name": "Muted Green",
      "hex_code": "
                            
                            #B8E4C9
                        "
    },
    {
      "name": "Warm Gray",
      "hex_code": "
                            
                            #D1D3D4
                        "
    },
    {
      "name": "Dusty Rose",
      "hex_code": "
                            
                            #EAB8C8
                        "
    },
    {
      "name": "Pale Yellow",
      "hex_code": "
                            
                            #F2E7D5
                        "
    },
    {
      "name": "Cool Teal",
      "hex_code": "
                            
                            #A3D0D5
                        "
    },
    {
      "name": "Slate Blue",
      "hex_code": "
                            
                            #6A88C6
                        "
    },
    {
      "name": "Soft Lavender",
      "hex_code": "
                            
                            #E1C6E7
                        "
    }
  ]
}

This palette includes a variety of colors that can be used effectively in Excel spreadsheets without being too bright or overwhelming. Would you like any specific suggestions on how to use these colors in your Excel sheets, or do you have any other requests?