However, once you you get your own site design in place, the RichFaces skins probably won’t match your design perfectly. You can always override any of the particular element styles using CSS, but if you want to quickly change the global look and feel for all the RichFaces components, the easiest thing to do is to create a customized RichFaces skin.
You should start with the RichFaces skin that most closely matches your design and build your custom skin based on that. The skins are defined in properties files in the RichFaces jar file under /META-INF/skins/. You can also just download them from here, to avoid having to unpack the jar file yourself: richfaces-skins.zip.
Copy the skin file that’s closest to your design into your project. If you’re using a Seam project created with seam-gen, you’re in luck because the ant build file is already setup to deploy RichFaces skins if you have them. Just drop the skinname.skin.properties file into the “resources” directory of your Seam project. Rename it to a custom name for your site’s skin, i.e. mysite.skin.properties.
Now you need to configure your application to use the new custom skin. Edit /resources/WEB-INF/web.xml, and change the org.richfaces.SKIN param to the name of your new skin: