This Classroom Displays pool is a collection of more than 3,700 images of bulletin board displays and artwork submitted by mostly elementary school teachers. It provides ideas on how student art can be incorporated across the curriculum with math, science, social studies and language arts.

From site:   I often get requests for sample bulletin boards for all grade levels that can be found on the Net. I have collected a list of some of the sites and pages with ideas and included a few samples, too. If you know of any other links, or have a Web page which includes your favorite bulletin boards, please send me the link!