I\'m hoping to use a custom richfaces skin to handle the bulk of my presentation work. Unfortunately richfaces renders borders around every cell in a calendar component and
RichFaces has a skin system built in called Skinnablity. Skinnability is a high-level extension of standard CSS. You can create your own skin file to use in your application(jboss documentation).
In the richfaces-impl jar, the folder /META-INF/skins contains all the skin files (.skin.properties). Copy one and rename name it, modify what you want. You will have to rebuild the jar.
OR
You can use the plug-n-skin feature of richfaces, which i've never tried before but looks like it would also work for what you are trying to do.