Here is a color palette based on your request for darker pastel blues:

json
{
  "palette_name": "Subdued Pastel Blues",
  "colors": [
    {
      "name": "Dusty Blue",
      "hex_code": "
          
          #5B8DB1
       "
    },
    {
      "name": "Slate Blue",
      "hex_code": "
          
          #4A7C99
       "
    },
    {
      "name": "Faded Sky Blue",
      "hex_code": "
          
          #7DA8B8
       "
    },
    {
      "name": "Muted Cerulean",
      "hex_code": "
          
          #6A9BAA
       "
    },
    {
      "name": "Soft Denim",
      "hex_code": "
          
          #4B98B2
       "
    }
  ]
}

This palette features various shades of blue that are darker than traditional pastels but still maintain a soft, muted quality. Would you like to explore additional shades or different color themes?