You can change the color theme for specific dashboard charts. By default, charts use the same theme as the dashboard page they are on.
You can only change the theme for a chart if you are the owner. See Transferring dashboard chart and item view ownership.
1. Click Dashboards.
The Dashboards area opens.
2. Click the tab for the page that contains the chart.
3. Mouse over the chart, click 
, select Theme, and select a color or color palette to use.
To reset the chart to use the same theme as the dashboard page, select Use page theme.