You can copy any public set (or private set you have access to) so you can make tweaks and save a version as your own.
Copy the Set
Click the "Copy" button underneath "More Tools" on the upper right of the main set page.
The "Copy" button will copy the title and description along with the terms and definitions.
Make your changes
You can change the title and description as well as the terms and definitions.
Add extra terms or images. Delete terms. Or correct mistakes.
You can also change the privacy settings.
Save the Set
Click "Create set" at the bottom of the page.
The set is now yours to use, but it will show who you copied it from on the Info tab of the set page.