Here is the updated color palette with less saturated colors replacing Light Green, Light Sea Green, and Pale Turquoise:

json
{
  "palette_name": "Light Header Colors",
  "colors": [
    {
      "name": "Light Blue",
      "hex_code": "
          
          #ADD8E6
       "
    },
    {
      "name": "Light Gray",
      "hex_code": "
          
          #D3D3D3
       "
    },
    {
      "name": "Light Coral",
      "hex_code": "
          
          #F08080
       "
    },
    {
      "name": "Light Yellow",
      "hex_code": "
          
          #FFFFE0
       "
    },
    {
      "name": "Lavender",
      "hex_code": "
          
          #E6E6FA
       "
    },
    {
      "name": "Peach Puff",
      "hex_code": "
          
          #FFDAB9
       "
    },
    {
      "name": "Misty Rose",
      "hex_code": "
          
          #FFE4E1
       "
    },
    {
      "name": "Light Goldenrod Yellow",
      "hex_code": "
          
          #FAFAD2
       "
    },
    {
      "name": "Honeydew",
      "hex_code": "
          
          #F0FFF0
       "
    },
    {
      "name": "Lavender Blush",
      "hex_code": "
          
          #FFF0F5
       "
    },
    {
      "name": "Beige",
      "hex_code": "
          
          #F5F5DC
       "
    },
    {
      "name": "Light Slate Gray",
      "hex_code": "
          
          #778899
       "
    }
  ]
}

This updated palette maintains a light and soft aesthetic while using less saturated colors. Would you like further modifications or assistance with anything else?