Google Slides only offers a few options for backgrounds or templates. Try out Slides Carnival and instantly make your presentations more professional and stylish.
All you have to do is find a template you like, click on it.
>It will bring you to a page where you can preview the presentation.
>Click the yellow button that says "USE THIS PRESENTATION TEMPLATE."
>It will bring you to a Google Slides presentation that you can't edit.
>Click "FILE" and then "MAKE A COPY"
It will automatically save a copy to your drive folder. Make sure to keep the credits page at the end of the presentation and give the developers the credit they are due.
Enjoy! Please let me know if you have any questions.