The backbone of your presentation is always your story. Your visuals exist to make your story more powerful, so it's important to choose them carefully.
Presentation visuals do not have to be limited to slides. In fact, it's often much more powerful to use props when they make sense.
This video from Ze Frank is a perfect example of the power of props as visuals. It is a moving and inspirational visualization of a human lifespan, told with 28,835 JellyBeans.
I guarantee you will remember this better than if he had used slides to tell the same story.