Here is a color palette based on your request for a lighter version of the color #a78bfa :

json
{
  "palette_name": "Lightened Lavender",
  "colors": [
    {
      "name": "Lavender Light",
      "hex_code": "
                            
                            #C6B3F5
                        "
    },
    {
      "name": "Lavender Lighter",
      "hex_code": "
                            
                            #D3C4F9
                        "
    },
    {
      "name": "Lavender Soft",
      "hex_code": "
                            
                            #E0D5FC
                        "
    },
    {
      "name": "Lavender Very Light",
      "hex_code": "
                            
                            #E7E2FE
                        "
    },
    {
      "name": "Lavender Pastel",
      "hex_code": "
                            
                            #F3F0FF
                        "
    }
  ]
}

This palette features various shades of lavender that are lighter than the original color you provided ( #a78bfa ), creating a soft and soothing visual experience.

Would you like to explore more colors or perhaps create a combination with another color?