My friend Rebecca was replacing her bed. The old one had a lot of very springy plywood slats, far too good to let go to the tip. So I detached them, bound them up with tape, and brought them back home on the back of my bike.
They're too wide to make a bow on their own, the ends of a bow need to be considerably less stiff than the centre where you hold it. And they weren't long enough to make a bow on their own, I'd have to bolt two of them together.