Sarah's Collage of (for?) "To Kill A Mockingbird"

Isn't this great? I think it looks a little like a ransom note. They were supposed to cut out pictures from magazines that represented aspects of the story and they got extra points for originality.

Ok, I can't decide if the title should be "of" or "for." Would someone who got 100% on the grammar test help me out?

Updated to correct the title of the book so that you guys don't think that I'm a complete Philistine and moron. I'm so glad I turned off Blog Mad today or I would have had hundreds seeing that mistake over and over again.