Cool Bulletin Board idea to "spotlight" a student or famous person. I would do both. Maybe every week a different actor, playwright, designer, etc to research to extra credit or a weekly report, and every now and then a student, to make them feel special having been up on the same wall as a big name.
A worksheet to help students learn the basic differences between elements, compounds and mixtures using illustrations/visuals.
I have used this site for years to introduce force and motion with the roller coaster. great conversations arise as students manipulate one variable at a time and ultimately try to make the fastest coaster that doesn't fly off into the air!