Here is a vibrant autumn color palette perfect for a children’s poster:

json
{
  "palette_name": "Autumn Adventure",
  "colors": [
    {
      "name": "Pumpkin Orange",
      "hex_code": "
                            
                            #FF7518
                        "
    },
    {
      "name": "Golden Yellow",
      "hex_code": "
                            
                            #FFD700
                        "
    },
    {
      "name": "Crimson Red",
      "hex_code": "
                            
                            #C72C48
                        "
    },
    {
      "name": "Forest Green",
      "hex_code": "
                            
                            #228B22
                        "
    },
    {
      "name": "Sky Blue",
      "hex_code": "
                            
                            #87CEEB
                        "
    }
  ]
}

This palette captures the warm and cheerful essence of autumn, featuring vibrant oranges, yellows, reds, and greens that will appeal to children and make the poster eye-catching and lively.

Would you like to see some design ideas or themes that could match this color palette?