In August I posted about some sites with classroom display ideas. At the British site Teaching Ideas there is an entire section devoted to images of creative classroom displays. Just click on the subject-area you teach, and bunches of cool bulletin board ideas will appear. For science class, you can make a Funny Bones display like the one shared by Teaching Ideas contributer, Kate.
Foreign language students would love a vocabulary display inspired by favorite characters like this one.
Images from Teaching Ideas