Here is a color palette based on your request for a flat color design, starting with the hex code #EFA3A3 , and including a yellow, white, baby blue, and some darker blues that resemble water.

json
{
  "palette_name": "Water-Inspired Flat Design",
  "colors": [
    {
      "name": "Soft Pink",
      "hex_code": "
                            
                            #EFA3A3
                        "
    },
    {
      "name": "Sunny Yellow",
      "hex_code": "
                            
                            #F6EB61
                        "
    },
    {
      "name": "Pure White",
      "hex_code": "
                            
                            #FFFFFF
                        "
    },
    {
      "name": "Baby Blue",
      "hex_code": "
                            
                            #A4D8E1
                        "
    },
    {
      "name": "Deep Blue",
      "hex_code": "
                            
                            #005F85
                        "
    },
    {
      "name": "Ocean Blue",
      "hex_code": "
                            
                            #007B9A
                        "
    },
    {
      "name": "Navy Blue",
      "hex_code": "
                            
                            #003D5B
                        "
    }
  ]
}

This palette features a soft pink as your starting color, accompanied by a sunny yellow and pure white for brightness. The baby blue adds a gentle touch, while the deeper blues evoke the feeling of water.

Would you like to explore more colors, or do you have specific design ideas in mind for this palette?