Here is a pretty cool Keynote template, Blue Chalkboard. I found the background at a pretty cool little website called Love Textures. You should definitely check them out. Its a pretty basic template with the background look as though its in transition from white to black through blue. Other than that this keynote shouldn’t have any trouble playing on any of your Apple devises. The original texture file is pretty large, and could be re-sized to save some space. I hope you enjoy! Let me know what you think.