You could try to sell some of the pumpkins at a Farmers market. (an aside--) you may want to can up as much as you can as an article I read today-here in our area of central Illinois, the bees that pollinate pumpkin patches are dying off. The punkin patches depend on the bees for pollination and punkins may be scarcer and more costly next year.
Our farm has so many rocks, we use them for lining the flower beds and to fill in wash out areas of our little stream. If they are the really big ones, people want them to landscape with and you may be able to sell some of them.
My hubby made a bicycle cart for me out of a plastic barrel. He cut it in half, mounted it onto a homemade axle and welded a tongue so it could attach to my bicycle, under the seat. Our son knew how to ride his bike, but was too little to keep up with the rest of us, so we put a low, sand lawn chair in the barrel and he could sit quite nicely on our weekly trips into town to the library and grocery store. Looked quite jaunty with the tall golf flag attached at the back. We've also used the barrels as a dog house. Place it between two concrete blocks out of the wind and put a little straw or pine bedding in it. The cats seem to like it as well on occasion.
The wire, if you are handy could be made into different shaped garden supports or trellis' for taller flowers, I love getting ideas from the garden catologs.
You could fashion the tank into a pool, hot tub or holding tank for rain water. We have a used milk holding tank and are trying to decide which would be the best use for it. I'm often tempted to just fill it with water and jump into it on those summer days when it hits 90.

It has a drain, so I could also use the water on the garden so none would be wasted.
Oh, thank you for the used tarp idea. We made some new raised garden beds & I'll be putting down the old tarps between them for weed control. We have also, in the past, folded over the edges and put new grommets for continued useage.
Other than haul them for scrap metal what could one do to recycle old farm gates? Origianlly 8 to 10 feet long, but now bent or rusted through in places.