If you've created a great set of Slide Library items, in addition to the option for setting up a Team Slide Library, you also have the option to just share a personal Slide Library with a specific colleague.

Any Shape or Slide you've added to the Slide Library for PowerPoint is saved by default into your Personal library.

You can share this Slide Library with a colleague via email. In the Slide Library Toolbar, on the "Actions..." menu, click "Share Personal Gallery via email..."

Your personal Slide Library will be attached to a new email with all the instructions your colleague needs to add as a new Slide Library. Note that sharing a personal Slide Library provides the recipient with a copy of the Slide Library.

To share a common Slide Library with colleagues that can be centrally updated, we recommend using the Team Slide Library for PowerPoint feature