Here’s an updated light rainbow color palette with 12 colors that maintains the overall theme:

json
{
  "palette_name": "Updated Light Rainbow Excel Palette",
  "colors": [
    {
      "name": "Matt Pink",
      "hex_code": "
          
          #FFB3BA
       "
    },
    {
      "name": "Pandora’s Box",
      "hex_code": "
          
          #FFDFBA
       "
    },
    {
      "name": "Yell Yellow",
      "hex_code": "
          
          #FFFFBA
       "
    },
    {
      "name": "Toxic Steam",
      "hex_code": "
          
          #BAFFC9
       "
    },
    {
      "name": "Broad Daylight",
      "hex_code": "
          
          #BAE1FF
       "
    },
    {
      "name": "Violet Heaven",
      "hex_code": "
          
          #D6BAFF
       "
    },
    {
      "name": "Mauve",
      "hex_code": "
          
          #E6B3FF
       "
    },
    {
      "name": "Apricot Haze",
      "hex_code": "
          
          #FFABAB
       "
    },
    {
      "name": "Peachy Keen",
      "hex_code": "
          
          #FFCCBA
       "
    },
    {
      "name": "Minty Fresh",
      "hex_code": "
          
          #BAFFD9
       "
    },
    {
      "name": "Sky Blue",
      "hex_code": "
          
          #A1C6FF
       "
    },
    {
      "name": "Lavender Mist",
      "hex_code": "
          
          #E2C6FF
       "
    }
  ]
}

This palette retains the light, vibrant feel of the original while expanding to include additional soft and complementary colors.

Would you like any further adjustments or have specific color requests for the new additions?