On ZendCasts.com today there's a new screencast aimed at showing off custom Zend_Form decorators for your Zend Framework application.
This little video tutorial should set you up for building your own custom Zend_Form decorators in 15 minutes. I’ll show you how you can make the necessary class and have it easily added to your existing Zend_Form_Decorator configuration.
If you'd like to follow along with the tutorial as he walks through it you can grab a copy of the source or, for other examples, look through their repository.