Here is a color palette based on your request for dark, mellow, desaturated colors that are easy to look at and visually distinct:

json
{
  "palette_name": "Mellow Dark Tones",
  "colors": [
    {
      "name": "Deep Slate",
      "hex_code": "
                            
                            #4A5568
                        "
    },
    {
      "name": "Muted Olive",
      "hex_code": "
                            
                            #4F5D75
                        "
    },
    {
      "name": "Dusty Plum",
      "hex_code": "
                            
                            #5B4B8A
                        "
    },
    {
      "name": "Charcoal Gray",
      "hex_code": "
                            
                            #2D3748
                        "
    },
    {
      "name": "Soft Teal",
      "hex_code": "
                            
                            #2B6C8E
                        "
    }
  ]
}

This palette features a selection of dark and desaturated colors that maintain visual distinctiveness while providing a mellow aesthetic.

Would you like to see more variations or perhaps a specific application for these colors?