Here is a color palette based on your request for 90 shades of green:

json
{
  "palette_name": "90 Shades of Green",
  "colors": [
    {"name": "Forest Green", "hex_code": "
          
          #228B22
       "},
    {"name": "Lime Green", "hex_code": "
          
          #32CD32
       "},
    {"name": "Olive Drab", "hex_code": "
          
          #6B8E23
       "},
    {"name": "Dark Olive Green", "hex_code": "
          
          #556B2F
       "},
    {"name": "Medium Sea Green", "hex_code": "
          
          #3CB371
       "},
    {"name": "Sea Green", "hex_code": "
          
          #2E8B57
       "},
    {"name": "Pale Green", "hex_code": "
          
          #98FB98
       "},
    {"name": "Light Green", "hex_code": "
          
          #90EE90
       "},
    {"name": "Chartreuse", "hex_code": "
          
          #7FFF00
       "},
    {"name": "Yellow Green", "hex_code": "
          
          #9ACD32
       "},
    {"name": "Green Yellow", "hex_code": "
          
          #ADFF2F
       "},
    {"name": "Spring Green", "hex_code": "
          
          #00FF7F
       "},
    {"name": "Medium Spring Green", "hex_code": "
          
          #00FA9A
       "},
    {"name": "Dark Sea Green", "hex_code": "
          
          #8FBC8F
       "},
    {"name": "Light Sea Green", "hex_code": "
          
          #20B2AA
       "},
    {"name": "Dark Green", "hex_code": "
          
          #006400
       "},
    {"name": "Medium Aquamarine", "hex_code": "
          
          #66CDAA
       "},
    {"name": "Mint Cream", "hex_code": "
          
          #F5FFFA
       "},
    {"name": "Honeydew", "hex_code": "
          
          #F0FFF0
       "},
    {"name": "Green", "hex_code": "
          
          #008000
       "},
    {"name": "Lawn Green", "hex_code": "
          
          #7CFC00
       "},
    {"name": "Medium Forest Green", "hex_code": "
          
          #4F7942
       "},
    {"name": "Shamrock Green", "hex_code": "
          
          #009E4E
       "},
    {"name": "Emerald", "hex_code": "
          
          #50C878
       "},
    {"name": "Dark Emerald", "hex_code": "
          
          #046307
       "},
    {"name": "Moss Green", "hex_code": "
          
          #8A9A5B
       "},
    {"name": "Fern Green", "hex_code": "
          
          #4F8C2C
       "},
    {"name": "Jade", "hex_code": "
          
          #00A86B
       "},
    {"name": "Basil Green", "hex_code": "
          
          #5C6B3F
       "},
    {"name": "Tea Green", "hex_code": "
          
          #D0F0C0
       "},
    {"name": "Pastel Green", "hex_code": "
          
          #77B300
       "},
    {"name": "Apple Green", "hex_code": "
          
          #8DB600
       "},
    {"name": "Avocado Green", "hex_code": "
          
          #56806F
       "},
    {"name": "Celadon Green", "hex_code": "
          
          #2F847C
       "},
    {"name": "Pine Green", "hex_code": "
          
          #01796F
       "},
    {"name": "Dark Mint Green", "hex_code": "
          
          #3EB489
       "},
    {"name": "Aquamarine", "hex_code": "
          
          #7FFFD4
       "},
    {"name": "Light Olive Green", "hex_code": "
          
          #B3CDA2
       "},
    {"name": "Olive Green", "hex_code": "
          
          #808000
       "},
    {"name": "Bottle Green", "hex_code": "
          
          #007A33
       "},
    {"name": "Screaming Green", "hex_code": "
          
          #66FF00
       "},
    {"name": "Neon Green", "hex_code": "
          
          #39FF14
       "},
    {"name": "Dark Jungle Green", "hex_code": "
          
          #1A3E34
       "},
    {"name": "Celadon", "hex_code": "
          
          #A8D8B9
       "},
    {"name": "Khaki Green", "hex_code": "
          
          #B3B300
       "},
    {"name": "Islamic Green", "hex_code": "
          
          #007A33
       "},
    {"name": "Greenery", "hex_code": "
          
          #88B04B
       "},
    {"name": "Sage Green", "hex_code": "
          
          #B2B83E
       "},
    {"name": "Bitter Lime", "hex_code": "
          
          #B3D300
       "},
    {"name": "Asparagus", "hex_code": "
          
          #87A96B
       "},
    {"name": "Dark Seafoam Green", "hex_code": "
          
          #4E9D24
       "},
    {"name": "Yellow Green", "hex_code": "
          
          #9ACD32
       "},
    {"name": "Soft Green", "hex_code": "
          
          #A8D8B9
       "},
    {"name": "Fern", "hex_code": "
          
          #4F7942
       "},
    {"name": "Green Blue", "hex_code": "
          
          #007B5F
       "},
    {"name": "Cactus Green", "hex_code": "
          
          #F6B93B
       "},
    {"name": "Lime Punch", "hex_code": "
          
          #D2F8B2
       "},
    {"name": "Fern Green", "hex_code": "
          
          #4F8C2C
       "},
    {"name": "Celery", "hex_code": "
          
          #B2D600
       "},
    {"name": "Light Olive", "hex_code": "
          
          #B2C635
       "},
    {"name": "Dark Mint", "hex_code": "
          
          #3EB489
       "},
    {"name": "Moss", "hex_code": "
          
          #8A9A5B
       "},
    {"name": "Mountain Meadow", "hex_code": "
          
          #30B2A5
       "},
    {"name": "Yellow Green", "hex_code": "
          
          #9ACD32
       "},
    {"name": "Green Tea", "hex_code": "
          
          #C6D3A3
       "},
    {"name": "Olive Green", "hex_code": "
          
          #808000
       "},
    {"name": "Greenery", "hex_code": "
          
          #88B04B
       "},
    {"name": "Bamboo", "hex_code": "
          
          #F9E0B6
       "},
    {"name": "Dark Mint Green", "hex_code": "
          
          #4E9D24
       "},
    {"name": "Pine", "hex_code": "
          
          #01796F
       "}
  ]
}

This palette includes a wide variety of green shades, ranging from earthy tones to vibrant hues. Are there any specific shades you would like to know more about, or how do you plan to use this palette?