background images for power point slides
I create the graphics for our church presentation software. Often when I can't make it, I'll look around for inspiration. Here are some files I've created, some my friends have made, and some I've found for free. The best part of designing is seeing it take shape. Take your time and keep at it. The tools and powerful features in Photoshop and Illustrator will allow you to create images you once thought impossible. Eventually you'll find your skills in Photoshop, Illustrator, or another program. Scroll down to find backgrounds, images, announcement slides, etc.
find your basic background to build off of
The best background is a simple background. We use these pretty regularly because they are simple, and easily manipulated. If you want some tips for photoshop or illustrator head on over to www.deviantart.com they have tons of resources, tutorials, and even downloadable brushes. At the end of the day, these are just a few images you could get inspiration from. Keep looking, and keep creating.
learn from the best
Designing images, or backgrounds isn't easy at first. I would definitely recommend watching some tutorials on Youtube. The best part about learning is watching your abilities expand. Here are a few videos that illustrate the basics of design.