Based on the colors #4d161a (a deep red) and #15213b (a dark blue), here is a complementary color palette that incorporates those shades along with some harmonizing colors.

json
{
  "palette_name": "Crimson and Midnight",
  "colors": [
    {
      "name": "Deep Crimson",
      "hex_code": "
          
          #4d161a
       "
    },
    {
      "name": "Midnight Blue",
      "hex_code": "
          
          #15213b
       "
    },
    {
      "name": "Charcoal Grey",
      "hex_code": "
          
          #333333
       "
    },
    {
      "name": "Soft Rose",
      "hex_code": "
          
          #e6a7a1
       "
    },
    {
      "name": "Sky Blue",
      "hex_code": "
          
          #a7c6e7
       "
    }
  ]
}

This palette features a rich contrast between the deep crimson and midnight blue, complemented by a charcoal grey for depth, a soft rose for warmth, and a sky blue for a touch of freshness.

Would you like to explore more palettes or need help with a specific project?