home: Column(
  mainAxisAlignment: MainAxisAlignment.spaceEvenly,
  children: [
    Container(
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          Stack(
            children: [
              Container(
               color: Colors.red,
               height: 100,
               width: 100,
              ),
              Container(
                color: Colors.white,
                height: 50,
                width: 50,
              )
            ],
          ),
          Container(
            child: Stack(
              alignment: AlignmentDirectional.topCenter,
              children: [
                Container(
                 color: Colors.orange,
                 height: 100,
                  width: 100,
                ),
                Container(
                  color: Colors.pink,
                  height: 50,
                  width: 50,
                )
              ],
            ),
          ),
         Container(
            child: Stack(
              alignment: AlignmentDirectional.topEnd,
              children: [
                Container(
                 color: Colors.yellow,
                 height: 100,
                 width: 100,
                ),
                Container(
                  color: Colors.purple,
                  height: 50,
                  width: 50,
                )
              ],
            ),
          )
        ],
      ),
    ),
    Container(
      child: Row(
       mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          Container(
            child: Stack(
              alignment: AlignmentDirectional.centerStart,
              children: [
                Container(
                  color: Colors.green,
                  height: 100,
                  width: 100,
                ),
                Container(
                  color: Colors.blue,
                  height: 50,
                  width: 50,
                )
              ],
            ),
          ),
          Container(
            child: Stack(
             alignment: AlignmentDirectional.center,
              children: [
                Container(
                  color: Colors.cyan,
                  height: 100,
                  width: 100,
                ),
                Container(
                  color: Colors.black,
                  height: 50,
                  width: 50,
                )
              ],
            ),
          ),
          Container(
            child: (Stack(
              alignment: AlignmentDirectional.centerEnd,
              children: [
                Container(
                  color: Colors.blue,
                  height: 100,
                  width: 100,
                ),
                Container(
                  color: Colors.green,
                  height: 50,
                  width: 50,
                )
             ],
             )),
          )
        ],
      ),
    ),
    Container(
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          Container(
            child: Stack(
              alignment: AlignmentDirectional.bottomStart,
              children: [
                Container(
                  color: Colors.purple,
                  height: 100,
                  width: 100,
                ),
                Container(
                 color: Colors.yellow,
                  height: 50,
                  width: 50,
                )
              ],
            ),
          ),
          Container(
            child: Stack(
              alignment: AlignmentDirectional.bottomCenter,
              children: [
                Container(
                  color: Colors.pink,
                  height: 100,
                  width: 100,
                ),
                Container(
                  color: Colors.orange,
                  height: 50,
                  width: 50,
                )
              ],
            ),
          ),
          Container(
            child: Stack(
              alignment: AlignmentDirectional.bottomEnd,
              children: [
                Container(
                  color: Colors.white,
                  height: 100,
                  width: 100,
                ),
                Container(
                  color: Colors.red,
                  height: 50,
                  width: 50,
                )
              ],
            ),
          )
        ],
      ),
    ),
],
),
);
}
}

OBS: Indentação um pouco bagunçada p/ caber dentro dos 5000 caracteres max.