Numbers
Use chart styles in Numbers on Mac
You can customize the look of a chart and create a new style from the customized chart. You can also create a new chart style that reflects the colors in a favorite image. The new styles are saved along with the styles that come with the template, and you can apply them to other charts.
The thumbnail images at the top of the Chart tab in the sidebar represent predesigned chart styles that are specifically made to look good with the template you’re using. You can apply a different style to a chart at any time.