Creatus WordPress theme comes with custom widgets that you can take advantage of. You can extend these widgets at any time. If a widget is located in Creatus inc widgets folder, the Creatus child theme is able to override the widget.php file by copying it to child theme corresponding folder;

├─creatus/
│ ├─inc/
│ └──widgets/
│     └─thz-flickr/
│       └─views/
│         └──widget.php
│   
└─creatus-child/
  ├─inc/
  └──widgets/
      └─thz-flickr/
        └─views/
          └──widget.php