man, lots of great ideas here!
so, i'll throw a few into the mix.
right now i need a safe place to store fuel. so you could use it for that if its not connected or too close to other buildings.
i'm also thinking it would make a wicked compost pile if you could load it from the top and pull finished compost from the bottom.
we need pics! there are so many variables like size, what condition it's in, what it's made out of, etc....
here in kansas, there are lots of these old silos around. several i've seen have fully grown trees sticking out of the top! a local sawmill uses one to hold sawdust.
how about a wicked smokehouse? you could smoke whole hogs and sides of beef.
the possibilities are endless....
last comment is if you'll be using it for housing of some type, i would have it evaluated by a structural engineer or inspector to make sure it's safe. you don't want the leaning tower of piza in your back yard after you've sunk thousands into a retrofit.
amp