For some reason, I'm drawn to creating things that are just cool while not altogether useful (see my Animated Activity Designer post, though one could argue that it may in fact be useful). To that end, I decided to create a Vista Sidebar gadget that displays a screen saver of your choosing. Vista has some good screen savers that it shipped with and I've embedded screen savers before (in fact, I show how to do it in one of my books).
So go ahead and grab it from the Windows Live Gallery (link below). If enough people clamor and beg, I will post the source code. Here's a quick rundown of what I did:
Here's a screenshot of it in action using the Ribbons screensaver:
Here's the link:
Screen Saver Vista Sidebar Gadget