The cover should be a functionally attractive element of the yearbook, ideally it will represent a relevant aspect of your school. Careful thought should be invested in developing the cover design.
A yearbook cover should always communicate the publication's title and year. Excluding one or both aspects may make invoke an incomplete feeling. Secondary information that could feature on the front or back cover include your school's name, crest and theme.
Always remember that the cover spans three aspects - front, back, and spine. An intelligent option is to integrate the cover design across the front, spine and back cover elements.
The cover design should unify the yearbook, and linked to the concept or theme that the yearbook employs. While considering school traditions and colours, designs should be contemporary - communicating relevant aspects of schooling life in 2013.
A popular solution for cover designs is to use student artworks as a feature. A nice twist on this idea is to feature "runner-up" student artworks in smaller size on the back or inside covers.