Here is a color palette that is well-suited for an Excel sheet, providing dark enough backgrounds to allow for white text visibility:

json
{
  "palette_name": "Elegant Dark Palette",
  "colors": [
    {
      "name": "Charcoal",
      "hex_code": "
          
          #333333
       "
    },
    {
      "name": "Midnight Blue",
      "hex_code": "
          
          #1A1A4B
       "
    },
    {
      "name": "Dark Slate Gray",
      "hex_code": "
          
          #2F4F4F
       "
    },
    {
      "name": "Deep Purple",
      "hex_code": "
          
          #5D3A91
       "
    },
    {
      "name": "Rich Black",
      "hex_code": "
          
          #0C0C0C
       "
    }
  ]
}

This palette features a variety of dark tones that can enhance your Excel sheet while allowing for clear white text. The colors are designed to be visually appealing and maintain readability.

Would you like any specific shades or variations added to this palette, or do you have particular sections in the Excel sheet where you want to apply these colors?