I use them for the waterers for my chickens.
Also I cut them in half and use them as mini greenhouses for my ickle vegetables that are growing (keeps the woodpigeons off them.
Also, get the coke points off them and get free xbox games
Next year we'll asve a few for our homemade ciderrrr.
Half fill them with water, poke a few holes round the top, and the dog loves to chase them in the summer.
By the time they go in our recycle bin, they are good for nothing else but melting down to become a fleece!