I don't have any experience with creating Skins, but I have the tools to do it (Fireworks, etc.). I'm used to doing as much as I can with styles, but, I want to break out of the mold and start using Skins more, especially so that the look and feel of my apps can be ported to other platforms. Where do I get started?
http://www.adobe.com/devnet/flex/quickstart/skinning_components/
http://flashenabledblog.com/2008/06/27/tutorials-developing-extending-and-styling-flex-components/