If you are currently jailbroken on iOS 5 you can now return to skinning and theming your iPhone, iPad, or iPod touch to your heart's content -- Saurik's most recent update to Winterboard (0.9.3901) adds iOS 5 compatibility.
Although Winterboard is now compatible with iOS 5 it still isn't safe to assume that all themes and skins are. As always, make sure you're reading the descriptions carefully. In most cases themes just don't apply properly if they haven't been made compatible but it's still good to check.
Anyone found any awesome themes that work with iOS 5 they want to recommend? Let us know!