Here’s a color palette based on your specified colors, along with a suitable dark/neutral color that complements them:

json
{
  "palette_name": "Warm Earthy Tones with a Cool Accent",
  "colors": [
    {
      "name": "Crimson Red",
      "hex_code": "
          
          #C22E2E
       "
    },
    {
      "name": "Chestnut Brown",
      "hex_code": "
          
          #A76B44
       "
    },
    {
      "name": "Olive Green",
      "hex_code": "
          
          #7A672F
       "
    },
    {
      "name": "Slate Blue",
      "hex_code": "
          
          #5B5C8B
       "
    },
    {
      "name": "Teal",
      "hex_code": "
          
          #2C7070
       "
    },
    {
      "name": "Charcoal Gray",
      "hex_code": "
          
          #333333
       "
    }
  ]
}

This palette features warm earthy tones complemented by a cool accent of teal, with the addition of a dark charcoal gray that provides depth and neutrality.

Do you have a specific use case in mind for this palette, such as design or artwork?