ShapeOfView(
  shape: YOUR_SHAPE,
  elevation: 4,
  height: 300, //height & width are optional
  child: ...
),

ShapeOfView(
  shape: CircleShape(
    borderColor: Colors.white, //optional
    borderWidth: 2, //optional
  ),
  child: ...

ShapeOfView(
  shape: RoundRectShape(
     borderRadius: BorderRadius.circular(12),
     borderColor: Colors.white, //optional
     borderWidth: 2, //optional
  ),
  child: ...

ShapeOfView(
  shape: CutCornerShape(
     borderRadius: BorderRadius.circular(12);
  ),
  child: ...

ShapeOfView(
  shape: ArcShape(
    direction: ArcDirection.Outside,
    height: 20,
    position: ArcPosition.Bottom
  ),
  child: ...
)

ShapeOfView(
  elevation: 4,
  height: 300,
  shape: DiagonalShape(
    position: DiagonalPosition.Bottom,
    direction: DiagonalDirection.Right,
    angle: DiagonalAngle.deg(angle: 10)
  ),
  child: ...
)

ShapeOfView(
  shape: TriangleShape(
    percentBottom: 0.5,
    percentLeft: 0,
    percentRight: 0
  ),
  child: ...,
)

ShapeOfView(
  shape: BubbleShape(
    position: BubblePosition.Bottom,
    arrowPositionPercent: 0.5,
    borderRadius: 20,
    arrowHeight: 10,
    arrowWidth: 10
  ),
  child: ...,
)

ShapeOfView(
  shape: StarShape(
    noOfPoints: 5
  ),
  child: ...,
)

ShapeOfView(
  shape: PolygonShape(
    numberOfSides: 9
  ),
  child: ...,
)

ShapeOfView(
  shape: CustomShape(
    builder: (rect) => Path()
        ..moveTo(0, 0)
        ..close()
  ),
  child: ...,
)

class MyShape extends Shape {

  @override
  Path build({Rect rect, double scale}) {
    return Path()
       ..moveTo(0, 0)
       ..close();
  }

}

ShapeOfView(
  shape: MyShape(),
  child: ...,
)