How to customize your local Excel chart settings
1. Change the default chart
The default chart after installation of Excel is a 2-D Column chart, but you can easily change the default chart type.
See How to change default chart for more details.
2. Change the default colors that Excel uses for chart series
See How to change the default colors that Excel uses for chart series for more details.
See also this tip in French: Comment personnaliser les paramètres locaux de graphique Excel.