Here’s an expanded palette with 20 different colors, maintaining the same tone and lighter shades while introducing more variety for your Excel charts:

json
{
  "palette_name": "Expanded Light Excel Color Palette",
  "colors": [
    {
      "name": "Light Sky Blue",
      "hex_code": "
                            
                            #A4D8E1
                        "
    },
    {
      "name": "Light Sunset Orange",
      "hex_code": "
                            
                            #FFB86D
                        "
    },
    {
      "name": "Light Lime Green",
      "hex_code": "
                            
                            #D6E6A8
                        "
    },
    {
      "name": "Light Cherry Red",
      "hex_code": "
                            
                            #F5A3B0
                        "
    },
    {
      "name": "Light Royal Purple",
      "hex_code": "
                            
                            #A77BCA
                        "
    },
    {
      "name": "Light Golden Yellow",
      "hex_code": "
                            
                            #F9E6A8
                        "
    },
    {
      "name": "Light Teal",
      "hex_code": "
                            
                            #A0DBDB
                        "
    },
    {
      "name": "Light Slate Gray",
      "hex_code": "
                            
                            #B0B3B0
                        "
    },
    {
      "name": "Light Bright Magenta",
      "hex_code": "
                            
                            #F5A1C9
                        "
    },
    {
      "name": "Light Warm Beige",
      "hex_code": "
                            
                            #E5C9B1
                        "
    },
    {
      "name": "Light Aquamarine",
      "hex_code": "
                            
                            #A8E6D8
                        "
    },
    {
      "name": "Light Peach",
      "hex_code": "
                            
                            #FFDAB9
                        "
    },
    {
      "name": "Light Lavender",
      "hex_code": "
                            
                            #E6E6FA
                        "
    },
    {
      "name": "Light Mint Green",
      "hex_code": "
                            
                            #B2E0D4
                        "
    },
    {
      "name": "Light Salmon",
      "hex_code": "
                            
                            #FFA07A
                        "
    },
    {
      "name": "Light Periwinkle",
      "hex_code": "
                            
                            #D6D8FF
                        "
    },
    {
      "name": "Light Olive",
      "hex_code": "
                            
                            #C5D88D
                        "
    },
    {
      "name": "Light Steel Blue",
      "hex_code": "
                            
                            #B0C4DE
                        "
    },
    {
      "name": "Light Coral",
      "hex_code": "
                            
                            #F08080
                        "
    },
    {
      "name": "Light Cerulean",
      "hex_code": "
                            
                            #A1D3E0
                        "
    },
    {
      "name": "Light Butter Yellow",
      "hex_code": "
                            
                            #FFFACD
                        "
    }
  ]
}

This palette provides a range of 20 lighter colors, each offering a distinct hue while keeping a cohesive tone. Would you like to suggest any specific colors to include or make further adjustments?