The Reports window has a Manage Templates link which lists the current Report Templates available and allows you to export existing Templates and import new Templates. You can also De-Activate templates which prevents them from being used in a new report.

The Templates are standard HTML and JavaScript with template variables which get replaced with the various elements like the Saved Graphs when they are displayed.

You can export existing Templates, edit them with a good TextEditor and then re-import them and either change existing reports or add new reports to use the new Templates.

The variables available are: