Here's an idea for an open house bulletin board. "Making Friends at Preschool" I purchased these bears from my local teaching store and made the "earth" on poster board. Put the Earth in the middle of the bulletin board and join the bears hands together around it in a circle. I write the children's names on the bears with a whiteboard marker. (easily removed after I take down the board). Everything is laminated for re-use. Cut out letters to make "Making Friends at Preschool" above the board.
This larger than life fish bowl coincides with our water life theme. It is made from a large piece of white bulletin board paper and colored with crayons and markers (yes it was time consuming but well worth the kids faces) I added some colored rocks, castle etc. This is an interactive board as the children create their own fish in the art center and are then put "in" the bowl!