You can download PowerPoint backgrounds at SlideEgg. The templates are in editable mode you can change it as per your wish.
Microsoft has free PowerPoint backgrounds to download and this is a reliable source. There are other sources too such as brainbetty and freepptbackgrounds.
photobucket.com is a great website to find animated backgrounds!
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Extra backgrounds or Microsoft's PowerPoint presentation program can be found under the following screen directions: View, Edit, Background, pictures.
You can find free Christian background PowerPoint templates on Slide Egg. They provides bunch of templates with Christmas theme. Their templates are with editable feature. Hope this helps you.
google.com
Carfax
The best website will be www.hotlayouts.com
Yes
Nativity PowerPoint backgrounds can be free at SlideEgg. Ready to use! Create a stunning presentation with Cute Slide Backgrounds PowerPoint Template. Easy to Edit. Fully Customizable. 100% Professional PPTfImpressive background design makes your PowerPoint visual treat. Customizable slides are at Free - Best Slide Templates Business Presentation Slide ,Effective Aesthetic Pastel Pink Wallpaper Presentation by which you can change your background colour .Text can be edited using tool with different background design. Templates from SlideEgg provides impressive presentation.
The website http://www.poweredtemplate.com has a wide selection of free PowerPoint templates in various categories. They look professional and high quality.
Yes, Weebly is a great website builder. In fact, I'm building a website with Weebly right now, and it's REALLY easy to use; it is a lot like Powerpoint pretty much.