I did a Hollywood theme in my fourth grade classroom last year and it was a huge hit!
On one of my walls I hung red curtains and pulled it to the sides like in the movie theaters. Between the curtains I put white construction paper and placed my classroom TV in front of it.
On another wall I bought 2 movie posters from Walmart and hung them. Beneath them I put "coming attractions" and "now showing." I changed them every two months and the students even brought some to hang.
I also found a great website called The Hollywood Megastore. The website address is http://www.hollywoodmegastore.com
. I bought several oscar statues, empty movie reel cans, and various other decorations to put up around the room.
In my reading corner the bulletin board said "lights, camera, read!"
I put on my door "Welcome to Lewis theater" and put each students name on star.
Last but not least I bought from a popcorn vendor the old fashion boxes that popcorn used to come in, the square red and white ones, and put unpopped popcorn kernals in the bottom 1/3. I then put in glue that would dry clear and placed those around the classroom as decorations and allowed the students to use them as pencil holders.
Other ideas would be to put "coming to a cafeteria near you" next to your monthly lunch menu. If you send out a newsletter you can call it "reel news" or "live from the red carpet of Mr./Mrs. ____ room."
I hope these ideas help and good luck!