If you use Google Slides for your class work, sometimes you may miss the traditional PowerPoint templates and themes.
However Google Slides also has a large number of ready-to-use templates, you can find the templates by going to slides.google.com and choosing them from template gallery. There you can find a good number of topics classified by categories and ready-to-use.
If you still think that they are not enough, I recommend you go to my favorite template site Slides Power where you can download wonderful and ready-to-use themes for Google.
You need login in google to be able to access and then the only thing you have to do is to choose a template of the dozens that there are and make a copy to save it on your computer or on your drive. You also have a button to download the template as a Power Point file.
There you can find a good number of topics classified by categories (elegant, simples, creatives...) and ready to use. I also found some very funny about Halloween, Christmas or Valentin’s Day.
Curiously I found some very interesting templates to use in class as the Civil War that even provides information and images of historical figures.
Each presentation is composed of 28 or more different slides each with its own design. Obviously, you can use all or discard those you do not like for your presentation.
If you don't have experience whit Google slides don't worry you can read one complete guide for Google Slides "How to make a good presentation" on the same site. A very useful and simple way to see step by step how to prepare your presentation.
In all themes, you can change backgrounds of any slides, replace typographies, add photos and of course you have numerous graphic icons that help in understanding the messages.
I hope you like them.