Custom Styles & Skins for OBIEE 11g
By Rob Reynolds on Jul 19, 2012
This is a topic that has been coming up more and more in conversations with customers. Mainly, customers looking to define a lightweight style for mobile specific dashboards. There is a detailed whitepaper that was released a while back with specifics on the modification and customization of your OBIEE 11g deployment.
Another excellent resource is this Oracle by Example tutorial - Creating and Deploying Custom Styles, Skin, and Messages in Oracle BI EE 11g
Both resources should get you going, but if you need additional assistance, Oracle Consulting is always ready to assist!