Here is a color palette that includes a very light shade of mustard yellow along with the previously mentioned shades.

json
{
  "palette_name": "Mustard Yellow with Very Light Shade",
  "colors": [
    {
      "name": "Very Light Mustard Yellow",
      "hex_code": "
                            
                            #F8E89D
                        "
    },
    {
      "name": "Light Mustard Yellow",
      "hex_code": "
                            
                            #E6C300
                        "
    },
    {
      "name": "Medium Mustard Yellow",
      "hex_code": "
                            
                            #FFC107
                        "
    },
    {
      "name": "Dark Mustard Yellow",
      "hex_code": "
                            
                            #B58B00
                        "
    },
    {
      "name": "Deep Mustard Yellow",
      "hex_code": "
                            
                            #A67C00
                        "
    }
  ]
}

This palette introduces very light mustard yellow, which offers a soft, pastel-like hue that complements the other shades beautifully.

Would you like to see more variations or perhaps use these colors in a specific design?