Can I create my own screensaver?

Yes. Just like adding your own wallpaper, Connect the nook to your PC or Mac.  Use the USB connection to download your own screensaver images to a new folder (like Coffee Screensaver) to the "My Screensavers" folder on your nook.

Then go to "Settings" and choose the set of screensaver to display. Some users report having to restart if the screensaver isn't found.