Grab a torch and heat them up for cutting foam.

Cut them into lockpicking tools.

Use a grinder to remove all sharp edges and then rivet them slightly overlapping to leather straps and then that leather strapping to heavy canvas. Now you have a set of wasteland armor.

Weld them into a vase or other container shape.

I would probably cut or break most of the blade off. Having that big diving board sticking out makes me think that if it's at a slight up angle, that extra length would give it leverage to bend upwards as the board is forced against it, which might catch your plane blade or worse, your arm.