ScaleNine offers a list of 10 Ways to Skin a Flex App. There are lots of great links to resources for skinning your app from CSS to programmatic skinning to 9-slice. What a terrific resource this single webpage is for any developers who work with Flex 2. Even if you are interested in only relatively minor customizations such as adding an exotic font to your app or icons which heighten the visual experience of it for users and improve the overall interface of it, you’ll find it in this listing. This would be an appropriate resource to pass around to your colleagues who also create Flex 2 apps, that is exactly what I did.