"The Crayon Box that Talked" is a great book to read aloud at the end of Black History Month to celebrate the concept of diversity.
In my classroom I have each student decorate a gift box where they list a character trait that is their unique gift to the class. You can find the full lesson plan from the Teaching Tolerance website listed below.
http://www.tolerance.org/exchange/what-can-we-learn-box-crayons