If you want, you can try out the SlideMagic plugin for PowerPoint. When installed, it opens a task pane on the rights side of your PowerPoint screen, you can log into SlideMagic, search for templates, which when downloaded appear in a new PowerPoint presentation. With a copy-paste or drag, you can add them to your presentation.
I am currently in the process of getting SlideMagic Ltd. approved as a Microsoft Partner to add it to the official Office app store. Microsoft is experiencing some capacity issues at the moment as the working-from-home-world is overloading its cloud servers.
To beta test the add-in in the mean time, you can do the following. This is a slightly advanced process, sorry.
Download the slidemagic.xml file here
On Mac follow these instructions (original on the Microsoft site). Copy the .xml file in this folder: /Users/<username>/Library/Containers/com.microsoft.Powerpoint/Data/Documents/wef (if you cannot see the Library folder in your Finder, select the ‘go’ dropdown in the Finder, then press the OPTION key and it should appear. Restart PowerPoint and a new icon “Start SlideMagic” should appear.
On Windows, the process looks a bit more tricky: see here.
The easiest is actually the online version of Office (instructions). Open PowerPoint in your browser, select Insert, select Add-ins, click manage my Add-ins, then upload my Add-in to upload the slidemagic.xml file.
This is all still work in progress.