I'm looking for creative ideas to reuse a 16x32 concrete in-ground pool. We don't swim in it enough to justify the ~ $1000 a year of electricity, chemicals, etc.

Ideally, it would be something that didn't cost more than we hoped to save and was reasonably reversible ... in case we ever sold the house.

We live in northern Alabama where the winters are mild, so one thought I had was building a greenhouse over it and making it a giant cold frame.