What would you do with a ton of very rusty metal?
My place of work backs onto the beach in Portsmouth harbour (UK) - the shore is littered with many pieces of very rusty metal - mostly big bolts, rods, nuts, huge washers etc - from the engineering works that used to be here, but there are also bits of old hardware that look like they came from some of the derelict barges that lie rotting in the estuary mud.
It's all in pieces small enough to pick up, and there's a ton of it. Some is so rusty that it's all rust, but most is merely heavily corroded/encrusted.
There's got to be something interesting that can be done with all this material, but... what?