How to change the Oracle ADF look and feel?

Oracle supports skinning i.e. changing the look and feel of the application.
You can develop your own skin e.g. CustomSkin.css

Step 1: Put CustomSkin.css and all dependent resources at the root
of your application e.g. /skins/myskin/CustomSkin.css

Step 2: Register the custom skin
In JDeveloper, right click on the WEB-INF folder of the sample project
and create a new XML document and name it - adf-faces-skins.xml
Replace the generated code with the following:

 <skins xmlns="http://xmlns.oracle.com/adf/view/faces/skin">
  <skin>
   <id>mycompany.desktop</id>
   <family>myskin</family>
   <render-kit-id>oracle.adf.desktop</render-kit-id>
   <style-sheet-name>/skins/myskin/CustomSkin.css</style-sheet-name>
  </skin>
 </skins>

Save your work.

Step 3: Modify adf-faces-config.xml file to use the custom skin.
Open the adf-faces-config.xml file.
Replace the <skin-family>value with custom skin family name
e.g. <skin-family>myskin</skin-family>

Save your work.

Step 4: Run your application and test.