How to Use an Image Instead of an Icon in Flutter?

ImageIcon widget is the most suitable widget to use images as icons in Flutter. You can use its property image to assign your own image.

ImageIcon(
     AssetImage("images/icon.png"),
     color: Colors.red,
     size: 24,
),

Also you can just convert images to svg icons and use as below,
There is one library to render SVGs on a canvas, available here: github

The API as of right now would look something like new SvgPicture.asset(‘asset_name.svg’).