Here’s a dark black and grey color palette suitable for Microsoft Excel:

json
{
  "palette_name": "Dark Black Grey Palette",
  "colors": [
    {
      "name": "Charcoal Black",
      "hex_code": "
          
          #1C1C1C
       "
    },
    {
      "name": "Gunmetal Grey",
      "hex_code": "
          
          #4B4B4B
       "
    },
    {
      "name": "Slate Grey",
      "hex_code": "
          
          #7E7E7E
       "
    },
    {
      "name": "Ash Grey",
      "hex_code": "
          
          #B2B2B2
       "
    },
    {
      "name": "Jet Black",
      "hex_code": "
          
          #0A0A0A
       "
    }
  ]
}

This palette features a range of dark shades from charcoal to jet black, perfect for creating a sleek and professional look in your Excel sheets.

Would you like more options, or do you need help with anything else related to Excel?