Here are two pastel color palettes: one based on brown and green for a light mode, and another for dark mode.

Light Mode - Pastel Brown and Green:

json
{
  "palette_name": "Pastel Brown and Green (Light Mode)",
  "colors": [
    {
      "name": "Pastel Olive Green",
      "hex_code": "
          
          #C2D6A6
       "
    },
    {
      "name": "Soft Tan",
      "hex_code": "
          
          #D5C3A1
       "
    },
    {
      "name": "Pale Sage",
      "hex_code": "
          
          #B7C9A8
       "
    },
    {
      "name": "Creamy Beige",
      "hex_code": "
          
          #E4D6C7
       "
    },
    {
      "name": "Light Chestnut Brown",
      "hex_code": "
          
          #D1A79D
       "
    }
  ]
}

Dark Mode - Pastel Brown and Green:

json
{
  "palette_name": "Pastel Brown and Green (Dark Mode)",
  "colors": [
    {
      "name": "Muted Forest Green",
      "hex_code": "
          
          #4B6F4D
       "
    },
    {
      "name": "Dark Taupe",
      "hex_code": "
          
          #7B6C5D
       "
    },
    {
      "name": "Deep Olive",
      "hex_code": "
          
          #5B6A57
       "
    },
    {
      "name": "Charcoal Beige",
      "hex_code": "
          
          #8C7B6D
       "
    },
    {
      "name": "Rich Chestnut",
      "hex_code": "
          
          #6F4C3E
       "
    }
  ]
}

The light mode palette features soft and calming tones of brown and green, while the dark mode palette incorporates deeper shades that still maintain a gentle aesthetic.

Would you like to modify any colors or explore additional themes?