Based on your query, here is a color palette that represents a soft, neutral theme suitable for a project timeline or flowchart. Each color in the palette has a light gray tone, providing a clean and structured appearance.

json
{
  "palette_name": "Soft Gray Progress Timeline",
  "colors": [
    {
      "name": "Light Gray",
      "hex_code": "
                            
                            #D3D3D3
                        "
    },
    {
      "name": "Black",
      "hex_code": "
                            
                            #000000
                        "
    }
  ]
}

Palette Description:

This palette features a primary color of Light Gray ( #D3D3D3 ) which is used for the background of each stage in your timeline, giving it a subtle and professional look. The Black ( #000000 ) is used for the stroke, providing contrast and clarity to the flowchart.

What kind of additional elements or features would you like to include in your flowchart?