I've been on a bit of a bulletin board kick after our art class.  These are some ideas that I've used in my "lessons."

Actually this is one that is at the Montessori pre-school.  I think it is a great idea and would be pretty easy to replicate.

I used this to help students learn the letters.  In a classroom I would have a lot more pictures so that there would be several examples of each letter.  The students would then be able to create a "dictionary" with at least one example of each phoneme.

This is a flannel board presentation of the song "Old MacDonald Had a Farm."

This is also be a flannel board of the song "There Was an Old Lady Who Swallowed a Fly."

This was very exciting for me to create.  It is a bulletin to be used with the song "And the Green Grass Grows All Around."  As the class learned the song we would add the pieces that correspond with each verse.