How to Change the Style of a PowerPoint 2007 Chart
Microsoft PowerPoint provides a large assortment of chart styles. Even if you already have a chart on your PowerPoint slide, you can change its style. To change the style for a PowerPoint chart, follow these steps:
Click the chart to select it.
The Ribbon expands to include the three Chart Tools tabs.
Click the Design tab.
The Design function pops into action.
Select the style you want to use from the Chart Styles group.
The Chart Styles group displays the most commonly used styles for the chart type. If the style you want to use isn’t visible in this group, you can click the More button to display a gallery of all available styles. (The More button is the down-arrow button at the bottom of the scroll bar that appears at the right side of the Chart Styles group.)