Here is an updated color palette based on your request, maintaining the “Professional Excel Palette Rainbow Pastels” theme and incorporating three new colors:

json
{
  "palette_name": "Updated Professional Excel Palette Rainbow Pastels",
  "colors": [
    {
      "name": "Metal Gear",
      "hex_code": "
                            
                            #A4C8E1
                        "
    },
    {
      "name": "Big Spender",
      "hex_code": "
                            
                            #B2E0B2
                        "
    },
    {
      "name": "Foggy Love",
      "hex_code": "
                            
                            #D1C6E7
                        "
    },
    {
      "name": "Plushy Pink",
      "hex_code": "
                            
                            #F1B2A5
                        "
    },
    {
      "name": "Meringue",
      "hex_code": "
                            
                            #F3E5B6
                        "
    },
    {
      "name": "Pleasing Pink",
      "hex_code": "
                            
                            #F8D1D4
                        "
    },
    {
      "name": "Soft Lavender",
      "hex_code": "
                            
                            #E1C6E7
                        "
    },
    {
      "name": "Mint Breeze",
      "hex_code": "
                            
                            #B6E0D8
                        "
    },
    {
      "name": "Peach Whisper",
      "hex_code": "
                            
                            #F2C6B6
                        "
    }
  ]
}

Palette Description:

The updated “Professional Excel Palette Rainbow Pastels” retains the light and soothing hues of the original palette while introducing three new colors: Soft Lavender, Mint Breeze, and Peach Whisper. These additions enhance the pastel theme, providing a harmonious blend of colors suitable for professional visual presentations or designs.

Would you like to adjust any specific colors or explore different shades?