Here are some great links to building dashboards in SCOM 2012 from Basic to Advanced
Basics
Introducing Operations Manager 2012 Dashboards
Operations Manager 2012 Dashboards – The Performance Widget
Creating SCOM 2012 Dashboards using Visio 2010 or Visio 2013
How to view SCOM 2012 Dashboards in SharePoint 2010
Installing SCOM 2012 Visio Dashboards in SharePoint 2013
How to Configure 360 .NET Application Monitoring Dashboards in System Center 2012 SP1
Product Specific
Windows Server OS – Task Pane Dashboard
System Center Virtual Machine Manager
SharePoint 2010 Dashboard Views for OpsMgr 2012
Exchange 2010 Dashboard Views for OpsMgr 2012
Active Directory 2008 Health Dashboard View for OpsMgr 2012
Advanced
How to boost the performance widget performance
Creating a map with server locations in OpsMgr 2012
Creating Dashboards with Excel Power View
Extend the OpsMgr 2012 Dashboarding capabilities
StatePlus Sample Widget for System Center 2012 Operations Manager
Creating a Widget for Operations Manager Dashboard – Walkthrough #1 – Custom UI Control
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