Here is a muted rainbow color palette that offers softer tones while still capturing the essence of the rainbow. This palette is designed to be visually appealing and easy on the eyes.

json
{
  "palette_name": "Muted Rainbow Years in Excel",
  "colors": [
    {
      "name": "Muted Red",
      "hex_code": "
          
          #D88B8B
       "
    },
    {
      "name": "Muted Orange",
      "hex_code": "
          
          #D8B58B
       "
    },
    {
      "name": "Muted Yellow",
      "hex_code": "
          
          #D8D88B
       "
    },
    {
      "name": "Muted Green",
      "hex_code": "
          
          #8BD88B
       "
    },
    {
      "name": "Muted Blue",
      "hex_code": "
          
          #8B8BD8
       "
    },
    {
      "name": "Muted Indigo",
      "hex_code": "
          
          #7A6FA6
       "
    },
    {
      "name": "Muted Violet",
      "hex_code": "
          
          #A68BB5
       "
    },
    {
      "name": "Muted Pink",
      "hex_code": "
          
          #D88BC4
       "
    },
    {
      "name": "Muted Teal",
      "hex_code": "
          
          #A8D8D8
       "
    },
    {
      "name": "Muted Lavender",
      "hex_code": "
          
          #D8D3E6
       "
    }
  ]
}

This muted rainbow palette should provide a gentle and harmonious representation of each year in your Excel sheets. Would you like to make any further changes or explore other options?