Robby Ingebretsen has created a version of Simple Styles that is designed for Silverlight.
Simple Styles are a set of styles and (more importantly) control templates that are designed to be a starting point for creating your own custom templates. The idea is to include all of the essential elements of the template and no extras. It’s a stripped down version of the control template, presented in full color (well, two colors) for your tweaking pleasure.