The Neon Lines Keynote Template will be a great tool to help you in your next presentation. Its striking colors alone are enough to keep your audiences attention (not to mention your excellent speaking skills). This template is made from an image I got on Interfacelift.com they have a great selection of free backgrounds that you could turn into your own Keynote templates.
I like this one because of its striking color combinations and patterns. You might think working with text on this background would be difficult, but you would be wrong. Its patterns allow for each text addition almost everywhere on the template.
In order to get another slide with this image simple go to the ‘Slide Inspector’ and select image fill from the background options and it should just place the image directly into the slide.