Here is a color palette based on various shades of grey, which includes 80 different grey tones:

json
{
  "palette_name": "Shades of Grey",
  "colors": [
    {"name": "Light Grey", "hex_code": "
          
          #D3D3D3
       "},
    {"name": "Silver", "hex_code": "
          
          #C0C0C0
       "},
    {"name": "Dark Grey", "hex_code": "
          
          #A9A9A9
       "},
    {"name": "Dim Grey", "hex_code": "
          
          #696969
       "},
    {"name": "Slate Grey", "hex_code": "
          
          #708090
       "},
    {"name": "Charcoal", "hex_code": "
          
          #36454F
       "},
    {"name": "Ash Grey", "hex_code": "
          
          #B2BEB5
       "},
    {"name": "Gainsboro", "hex_code": "
          
          #DCDCDC
       "},
    {"name": "Smoke Grey", "hex_code": "
          
          #7B7B7B
       "},
    {"name": "Cloud Grey", "hex_code": "
          
          #B8B8B8
       "},
    {"name": "Cool Grey", "hex_code": "
          
          #A7A8AA
       "},
    {"name": "Stone Grey", "hex_code": "
          
          #A99F8E
       "},
    {"name": "Graphite", "hex_code": "
          
          #7E7B7A
       "},
    {"name": "Platinum", "hex_code": "
          
          #E5E4E2
       "},
    {"name": "Shadow Grey", "hex_code": "
          
          #8B8B8B
       "},
    {"name": "Battleship Grey", "hex_code": "
          
          #7C7B7A
       "},
    {"name": "Cinder", "hex_code": "
          
          #6D6D6D
       "},
    {"name": "Iron", "hex_code": "
          
          #484848
       "},
    {"name": "Coal Grey", "hex_code": "
          
          #101820
       "},
    {"name": "Lead", "hex_code": "
          
          #4B4B4D
       "},
    {"name": "Dusty Grey", "hex_code": "
          
          #B4B4B4
       "},
    {"name": "Dove Grey", "hex_code": "
          
          #D6D6D6
       "},
    {"name": "Pewter", "hex_code": "
          
          #8C8B7A
       "},
    {"name": "Misty Grey", "hex_code": "
          
          #C6C6C6
       "},
    {"name": "Pearl Grey", "hex_code": "
          
          #E9E9E9
       "},
    {"name": "Fossil Grey", "hex_code": "
          
          #B7B7B7
       "},
    {"name": "Fog Grey", "hex_code": "
          
          #C5C5C5
       "},
    {"name": "Steel Grey", "hex_code": "
          
          #4B5D67
       "},
    {"name": "Zinc", "hex_code": "
          
          #6C6F72
       "},
    {"name": "Smoke", "hex_code": "
          
          #E1E1E1
       "},
    {"name": "Cement Grey", "hex_code": "
          
          #9B9B9B
       "},
    {"name": "Slate", "hex_code": "
          
          #708090
       "},
    {"name": "Ash", "hex_code": "
          
          #B2B2B2
       "},
    {"name": "Charcoal Grey", "hex_code": "
          
          #3A3A3A
       "},
    {"name": "Graphite Grey", "hex_code": "
          
          #3B3B3B
       "},
    {"name": "Dusk", "hex_code": "
          
          #7E7F80
       "},
    {"name": "Mist", "hex_code": "
          
          #C0C0C0
       "},
    {"name": "Light Ash", "hex_code": "
          
          #D1D1D1
       "},
    {"name": "Fog", "hex_code": "
          
          #A5A8A0
       "},
    {"name": "Cinder Grey", "hex_code": "
          
          #878787
       "},
    {"name": "Lead Grey", "hex_code": "
          
          #5B5B5B
       "},
    {"name": "Onyx", "hex_code": "
          
          #353839
       "},
    {"name": "Pigeon Grey", "hex_code": "
          
          #B7B1B1
       "},
    {"name": "Silver Grey", "hex_code": "
          
          #B7B7B7
       "},
    {"name": "Taupe", "hex_code": "
          
          #B5B5A5
       "},
    {"name": "Dove", "hex_code": "
          
          #B8B8C1
       "},
    {"name": "Cloud", "hex_code": "
          
          #E7E8E2
       "},
    {"name": "Palladium", "hex_code": "
          
          #A8A8A8
       "},
    {"name": "Graphite Blue", "hex_code": "
          
          #5B5D67
       "},
    {"name": "Shadow", "hex_code": "
          
          #4C4C4C
       "},
    {"name": "Pewter Grey", "hex_code": "
          
          #8C8C8C
       "},
    {"name": "Gunmetal", "hex_code": "
          
          #4A545D
       "},
    {"name": "Steel", "hex_code": "
          
          #A7A8AA
       "},
    {"name": "Storm Grey", "hex_code": "
          
          #A9A9A9
       "},
    {"name": "Granite", "hex_code": "
          
          #6C6F72
       "},
    {"name": "Dusk Grey", "hex_code": "
          
          #5A5A5A
       "},
    {"name": "Nickel", "hex_code": "
          
          #A8A8A8
       "},
    {"name": "Slate Blue", "hex_code": "
          
          #6D7F90
       "},
    {"name": "Iron Grey", "hex_code": "
          
          #484848
       "},
    {"name": "Smoke Blue", "hex_code": "
          
          #B7C9D8
       "},
    {"name": "Dove Blue", "hex_code": "
          
          #A4B6B0
       "},
    {"name": "Blue Grey", "hex_code": "
          
          #6B7C93
       "},
    {"name": "Cinder Blue", "hex_code": "
          
          #5B5B6C
       "},
    {"name": "Driftwood", "hex_code": "
          
          #A59C8D
       "},
    {"name": "Stone", "hex_code": "
          
          #B2B1A1
       "},
    {"name": "Fog Blue", "hex_code": "
          
          #A9B2B9
       "},
    {"name": "Dove Grey Blue", "hex_code": "
          
          #A6B6B6
       "},
    {"name": "Dust", "hex_code": "
          
          #B0B0B0
       "},
    {"name": "Pewter Blue", "hex_code": "
          
          #A1A8A4
       "},
    {"name": "Cinder Grey Blue", "hex_code": "
          
          #6C6E7A
       "},
    {"name": "Misty Blue", "hex_code": "
          
          #A8A8B0
       "},
    {"name": "Dusty Blue", "hex_code": "
          
          #B7B7BA
       "},
    {"name": "Cloud Blue", "hex_code": "
          
          #C3C3C3
       "}
  ]
}

This palette includes a rich diversity of greys, from light to dark shades, providing a versatile range for design purposes.

Would you like to explore any specific shades, or do you need help with a different palette?