PLEASE, PLEASE remember - Interactive bulletin boards are more engaging for students. 90% of the bulletin boards I see are "teacher delivery" of facts. Your question should be: How can I create a bulletin board where student's contribute to the content? So these ideas reflect this premise. These are ideas where the kids contribute content...thereby transferring ownership and fostering engagement.
1 - Wonder Wall - What are you wondering about today? - Light bulbs templates where kids can post questions that are either related to a deeper content investigation.... or just something random such as, "Why do insects have more legs than humans?" You could launch this bulletin board by showing them a wonder from "Wonderopolis" - asking what they think on the wonder...and then show them the short video clip answer from Wonderopolis.
2 - Question Stems -- In order to incubate the ability to question, place a major topic-problem-picture-or fact in the center of the bulletin board. Ask the students to come up with the ?'s about the picture-problem-fact etc. That way the kids see how one question...leads to many more. This incubates their questioning ability. Change the central question weekly. When students have free time, ask them to brainstorm questions for the central idea. If you have time, investigate the big idea on Friday for closure and place a new question-picture-problem-or-fact up for Monday.
3 - Fascinating Facts I Found - Pre-cut fact "F's" out and have them handy for kids to jot down something new they learned in a book, on a database, or during research. Contribute those to the FF bulletin board.
4 - Spring Board! - Dress the empty bulletin board for Spring and then teach a database asking kids to find a great Spring fact for contribution. Here's an essential Question for the middle: EQ - Why is Spring important? Ask them to use the "vocabulary of the discipline" if they can (i.e. vernal, equinox, rotation, etc....)
5 - Seasoning Reasoning - EQ: Which season is the most important? Find me a fact to support your claim! - Once again, asking kids to contribute to the board builds knowledge. When their peers post something, they'll be reading other's claims.
6 - Research Beyond Road Signs - Catch attention at the secondary level by asking them to find more than the "obvious." This is like research. We must move beyond the obvious to the why, how, what if, does... Place that statement in the middle of the board! Ask students in your library with nothing to do...to find you these obvious duh signs as below!