flutter:
  assets:
    - images/

Image.asset("images/myimage.jpg") // again, this in an example

Material(
   child: Stack(
      children: <Widget>[
             InkWell(
                 onTap: () {}, // The ripple only shows up if you have a onTap method.
                 child: Container(
                       height: 300, // 300 is a random value but has bigger height than the image itself.
                       child: Image.asset("images/myimage.jpg"),
                        ),
                 ),
             ],
    ),
)