Here is a color palette that includes variations of your original colors along with a brown color:

json
{
  "palette_name": "Muted Elegance",
  "colors": [
    {
      "name": "Light Gray",
      "hex_code": "
          
          #F0F0F0
       "
    },
    {
      "name": "Gray",
      "hex_code": "
          
          #909090
       "
    },
    {
      "name": "Dark Gray",
      "hex_code": "
          
          #303030
       "
    },
    {
      "name": "Medium Gray",
      "hex_code": "
          
          #606060
       "
    },
    {
      "name": "Pale Green",
      "hex_code": "
          
          #F0F090
       "
    },
    {
      "name": "Warm Brown",
      "hex_code": "
          
          #8B4513
       "
    },
    {
      "name": "Desaturated Olive",
      "hex_code": "
          
          #BDB76B
       "
    },
    {
      "name": "Cool Beige",
      "hex_code": "
          
          #D3CFC9
       "
    },
    {
      "name": "Soft Taupe",
      "hex_code": "
          
          #C2B280
       "
    }
  ]
}

This palette retains the muted tones from your original colors while adding a warm brown and some soft earthy variations.

Would you like to explore any specific uses for this palette, or do you need further adjustments?