I’ve seen people asking for learning materials to make a Flex app not look like a Flex app. I think if you look at some of the apps that are coming out like Picnik and Flip’s Flipbooks you can see some pretty neat design elements going in, not the standard Flex skins. If you want to learn more about how to create these kinds of apps, check out the Adobe Training course: Programming the Visual Experience. Total Training has released a DVD version of this course as well.
I think people have generally been very happy with these courses, so if you’ve got the interest I’d highly recommend them.