The color #E2EFDA is a soft and light shade of greenish pastel. A darker shade that complements this could be #B7D9B0 , which maintains the softness while providing a richer tone.

Here’s a quick palette including the original color and its darker shade:

json
{
  "palette_name": "Soft Green Shades",
  "colors": [
    {
      "name": "Light Green",
      "hex_code": "
          
          #E2EFDA
       "
    },
    {
      "name": "Darker Green",
      "hex_code": "
          
          #B7D9B0
       "
    }
  ]
}

This palette keeps the calming essence of the original color while introducing a deeper tone for contrast. Would you like to explore more shades or perhaps different color combinations?