Teen Read Week has 50 quick ideas including a discussion forum and Pinterest page. A few ideas that jumped out were redesigning a book jacket contest, creating book spine poetry, and hosting a comic book swap.
TOON Books - fantastic comic books for young readers. They also have free e-comic books on their site for young readers where they can click on any text if they need a little help. My 4 year old's favorite Toon Books character is Benjamin Bear because he thinks outside the box. Check it out!