Here’s a refined color palette incorporating Warm Sand and Slate Blue, along with two additional complementary tones:

json
{
  "palette_name": "Coastal Breezes",
  "colors": [
    {
      "name": "Warm Sand",
      "hex_code": "
                            
                            #f1dc94
                        "
    },
    {
      "name": "Slate Blue",
      "hex_code": "
                            
                            #7d99a3
                        "
    },
    {
      "name": "Coral Blush",
      "hex_code": "
                            
                            #ff6f61
                        "
    },
    {
      "name": "Seafoam Green",
      "hex_code": "
                            
                            #a8e6cf
                        "
    }
  ]
}

This palette blends the warmth of Warm Sand with the calming nature of Slate Blue, and adds Coral Blush for a vibrant touch and Seafoam Green for a refreshing accent.

Would you like any other specific colors or themes to be included in this palette?