Here is a pastel color palette based on your request, featuring pinks, blues, greens, and purples, while excluding yellow:

json
{
  "palette_name": "Pastel Dreams",
  "colors": [
    {
      "name": "Pastel Pink",
      "hex_code": "
          
          #FFB3D9
       "
    },
    {
      "name": "Pastel Blue",
      "hex_code": "
          
          #A3C1DA
       "
    },
    {
      "name": "Pastel Green",
      "hex_code": "
          
          #B2E6B4
       "
    },
    {
      "name": "Pastel Purple",
      "hex_code": "
          
          #D1B2E2
       "
    },
    {
      "name": "Pastel Lavender",
      "hex_code": "
          
          #E6D2E5
       "
    },
    {
      "name": "Pastel Mint",
      "hex_code": "
          
          #B2E5E0
       "
    },
    {
      "name": "Pastel Coral",
      "hex_code": "
          
          #FFB2B2
       "
    },
    {
      "name": "Pastel Sky Blue",
      "hex_code": "
          
          #A7C6ED
       "
    },
    {
      "name": "Pastel Lilac",
      "hex_code": "
          
          #D6C7E0
       "
    },
    {
      "name": "Pastel Teal",
      "hex_code": "
          
          #A7E6E1
       "
    },
    {
      "name": "Pastel Peach",
      "hex_code": "
          
          #FFD1B5
       "
    },
    {
      "name": "Pastel Seafoam",
      "hex_code": "
          
          #B3E1E5
       "
    }
  ]
}

This palette embodies a soft and dreamy aesthetic, perfect for designs that require a gentle touch. Would you like to know more about how to use these colors or any specific applications?