Before this last school year began, I'd bought several of these from Target to use in small groups. I found a neat way to use them in game format, thanks to catching an old rerun of "The Newlywed Game".
We played "Show What You Know!"
Basically, I divided up the class into groups, and gave each group one of those laminated boards and a write on/wipe off pen. Then I gave the question - anything on any subject that we've been studying. Gave them a few seconds to huddle and come up with an answer. Then I called out, "Show what you know!" They would show their answer they'd written on the board. I'd give a point to each group with the correct answer.
Winning group got a reward.