Back of a Web Page

This is a small, simple and limited idea, but it's executed so cleverly that I can't help but be impressed: hypothetical illustrations of what the back of some iconic Web sites might look like if they did indeed have a back. The first one, an illustration of reverse side of Google is fine, but they get much more clever very quickly. For instance, here's the back of YouTube:

See all of them — there aren't many, but they're all good — over here.