Depending on the topic of your talk and your audience, you may want to add small images to selected pages, or create an entire page with only an illustration or photograph. You need to make sure that you have space on a page for the image or illustration. However, there is no space on this page, so if you were really giving this talk, you would add one or more pages after Page 4 with illustrations of grids.
Clip art is easy to acquire.
Many images are included with Freelance Graphics and other sources of clip art may be used. You will have to decide on how appropriate images are for your presentation. Images are particularly useful if they support or further explain ideas. Another type of image that may need to be added is an organizational logo. For example, a logo could be added on the title page or to every page in the presentation.