Before we go into how you can work with specific styles and colors for your SmartArt graphic, we have to mention themes. A theme supplies the design of the whole presentation, and it is the basis for how all slides and slide elements look.
The first slide shown here has the basic PowerPoint theme applied, called Office Theme
. It's the plainest theme and is applied by default.
The second slide is the same slide with a different theme applied, called Module
As you see, the graphics look quite different just because of the theme. The theme determines the background design, slide colors, placeholder layout, text positioning, and font styles.
Working within the theme, you can select different styles and color variations just for the SmartArt graphic.