Here is a color palette based on your query for “Dark Blue”:

json
{
  "palette_name": "Deep Ocean",
  "colors": [
    {
      "name": "Midnight Blue",
      "hex_code": "
                            
                            #003366
                        "
    },
    {
      "name": "Navy Blue",
      "hex_code": "
                            
                            #000080
                        "
    },
    {
      "name": "Royal Blue",
      "hex_code": "
                            
                            #4169E1
                        "
    },
    {
      "name": "Teal Blue",
      "hex_code": "
                            
                            #008080
                        "
    },
    {
      "name": "Dark Slate Blue",
      "hex_code": "
                            
                            #483D8B
                        "
    }
  ]
}

This palette, named “Deep Ocean,” features a range of deep blue tones, conveying a sense of calmness and depth, reminiscent of the ocean at night.

Would you like to explore variations of this palette, or do you have another color in mind?