The six accent colors and the built-in effects are different in each of the 20 themes that
ship with Office 2007. You can change to any of the 20 themes or create your own theme
in order to easily access new colors and effects.
On the Page Layout ribbon, you can click the Themes drop-down to choose from the 20
built-in themes. If you choose a new theme from the Themes drop-down, Excel applies a
new color and set of effects to all of the charts in the current workbook. If you want to
change only the colors or effects, you can use the Colors or Effects drop-down ...
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