Creating a Blank Page: Blank pages are similar to items. However, the two do display content differently. Try adding an example of each, Blank Page and Item, to see how the two differ in delivery.
Creating Tool Links: In most cases it is more appropriate to add Tool Links to the menu rather than directly in a Content Area.
Creating a Mashup: Use the Mashup tools to add content from YouTube, Flickr, and SlideShare.