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
Once you copy the file over you can make desired changes to widget file and extend your creatus-child theme widget.