It would be great to have a template that has a few tiles on the dashboard page - each tile depicting an important metric/KPI. Since this is a common requirement in most applications, it would be great to see one available as a template.
Each tile - could have four labels - 1) Metric/KPI description 2) Value 3) UOM and 4) Image. Each of these tiles could have a ajax call associated with it whose implementation will be written by the developer.
You can refer to the Vaadin quick ticket application demo for the dashboard example.