Here is a color palette that features a grass green color that complements the vibrant red color code #ff3b30 :

json
{
  "palette_name": "Vibrant Red and Grass Green",
  "colors": [
    {
      "name": "Vibrant Red",
      "hex_code": "
                            
                            #ff3b30
                        "
    },
    {
      "name": "Grass Green",
      "hex_code": "
                            
                            #4CAF50
                        "
    },
    {
      "name": "Dark Green",
      "hex_code": "
                            
                            #388E3C
                        "
    },
    {
      "name": "Lime Green",
      "hex_code": "
                            
                            #8BC34A
                        "
    },
    {
      "name": "Pale Green",
      "hex_code": "
                            
                            #A5D6A7
                        "
    }
  ]
}

This palette features a vibrant red, along with various shades of green that evoke the feeling of grass, providing a fresh and energetic contrast. Would you like to explore more color combinations or have any specific shades in mind?