Modern office suites allow you to add graphics to any type of document. This includes pre-packaged graphics that comes with the suite.
LibreOffice and Microsoft Office have a series of graphics that are available to any document, regardless of whether it is a text document, spreadsheet, or presentation. Both suites have dialogs that allow for easy insertion of a desired graphic.
LibreOffice has 13 categories by default, and it allows you to create new categories as well as add more graphics. The section is called the Gallery.
In Microsoft Office, the dialog is called Icons. The graphics in this collection are all black and divided into 26 categories. No more can be added to the library, however. The icons are available in the Windows and Mac versions of Office.