I'm always up for a fun foldable and I got one from a friend of mine. She got it from a museum course she took with her daughter and snagged a couple of templates for me (Yay! Thanks Nichelle :)
It seems a bit complicated with all the mountain and valley folds but I have used it with several fourth grade classrooms and they got the hang of it pretty easily.
It can be used with any topic. I choose magnets because the finished foldable reminded me of a bar magnet.
To get a free copy of the foldable template check out my GOOGLE SITES HERE.