There are many possibilities for this module, but some that we have used or seen used include: -
- Place a video at the top of the page
- Show the related items listed in a left/right position
- Create an Author Info box in a left/right position
- List attachments in a left/right position
We are sure that you will come up with many more uses for this module and that it will be significantly easier than creating a K2 template override.