I have a very big bulletin board in my classroom and I spent hours in the past trying to make it look interesting and exciting for the kids as well as for open house. My tip is to buy a paper table cloth and tape it to the bulletin board. Right now I have a big Thanksgiving theme table cloth and I put up in large letters 'Things I Am Thankful For.' The kids take turns writing on the 'poster' when they have free time. I was surprised at how much they liked to do this and how many different things they are thankful for. Each month you can have a new theme for your table cloth. The sky's the limit! Have fun.