Some of this stuff is reposted from the distant past, most of it will work very well in English classes.
Weird Books
A site devoted to weird books. You can write the story, the book blurb, you can use as many titles as possible in a short story, build a video around the concept, interview the author, etc. etc.
Augmented Reality
Photo contest for the National Archives
Remix Dylan
Remix Dylan and some other tracks. Some aspects of this site I like, some not so much. You lose a lot of freedom to embed etc. but it is easy.