What images are suitable for business Presentations?

I had a question in a recent training session. What visuals and images are relevant to a Pow'Rful Presentation in a business setting? Photos are fine to communicate images that require photos, but how do you communicate the growth trend in sales with a photo?

The answer is "you don't". If you are communicating information that requires a graph, then use a graph with these guidelines:
1. Keep it simple. The fewer bar charts and lines the better.
2. Minimal or preferably no text.
3. Put the chart up, and talk to the chart. Don't have transitions that keep changing the chart to display growth.
4. Be aware that colors you use on the chart may display differently through the projector. Green on your screen may come out as yellow through the projector. If you need to use colors, limit the number of colors, and keep them in high contrast.