I think you can visit QlikView website's demo apps (Qlik Demos: See QlikView in Action | Demo.Qlik.Com). There are a bunch of dashboards capturing a lot of KPIs for different types of domains or industries. I'm sure you may find visualization related good guidance from those dashboards.
As I understood, you are asking a more general request, how to design a dashboard (i.e. more focused on general design than technical).
There are lots of sources that covers this, some are mentioned here:
I attached some tutorial that can help yo to improve your desig!
one useful thing to do it see a lot of demo example and get the best thing of them
Dashboards are most beautiful when you remove all unnecessary objects and decorations. Make it all about the data, not about colors, shadows, gradients, pie-charts. Less "fancy" means more attention to the actual data, which makes it beautiful.
I would highly recommend "Information Dashboard Design" by Stephen Few. Information Dashboard Design: Displaying Data for At-a-Glance Monitoring: Stephen Few: 9781938377006: Amazon.com: Books
And take a look at his website: Perceptual Edge