Slides Carnival has got to be the best site to get Free Templates for Google Slides and PowerPoint. They publish a new template fairly often. They integrate easily into Slides. All you have to do is make your own copy and then use the Template how you see fit. They always include a Graph slide, a map slide, a number slide, and just about any other kind of slide you would ever need. I highly recommend you check them out, maybe even donate a bit to them to help them keep sharing great templates with the masses.
Check out all the templates they have available.
http://www.slidescarnival.com/category/free-templates
Check out all the templates they have available.
http://www.slidescarnival.com/category/free-templates