Avatars: Create an avatar or profile image for your organization and your individual teams to make them more identifiable.
Cover pages: Create cover pages for your docs to customize the thumbnails in the file browser. You can do this by creating a design of the first page in any document. Here is a link to a Figma file to get you started.
Permissions at team level: When you need to share work with collaborators, consider granting them access at the team level if appropriate. You can always add collaborators to specific documents, but if you need to revoke access, it will be much easier to manage your list of users and their permissions at the team level, instead of remembering which specific files you invited them to.