borderradius solution

new Container(
                            width: 130.0,
                            height: 130.0,
                            decoration: new BoxDecoration(
                              color: const Color(0xff7c94b6),
                              image: new DecorationImage(
                                image: new AssetImage('images/lake.jpg'),
                                fit: BoxFit.cover,
                              ),
                              borderRadius: new BorderRadius.all(new Radius.circular(8.0)),
                              //  order: new Border.all(
                              //  color: Colors.green,
                              //  width: 1.0,
                              //  ),
                            ),
                          ),