Here is a color palette based on your request for a sports-themed mobile app featuring green, gold, whites, creams, and greys:

json
{
  "palette_name": "Sports Elegance",
  "colors": [
    {
      "name": "Sports Green",
      "hex_code": "
                            
                            #4CAF50
                        "
    },
    {
      "name": "Trophy Gold",
      "hex_code": "
                            
                            #FFD700
                        "
    },
    {
      "name": "Soft White",
      "hex_code": "
                            
                            #FFFFFF
                        "
    },
    {
      "name": "Cream",
      "hex_code": "
                            
                            #FFFDD0
                        "
    },
    {
      "name": "Cool Grey",
      "hex_code": "
                            
                            #B0BEC5
                        "
    }
  ]
}

This palette reflects the vibrant energy of sports with the green, the luxurious feel of gold, and the calming neutrals of whites, creams, and greys, making it ideal for a mobile app design.

Would you like to explore more colors or need assistance with anything else related to your app design?