here are a few ideas incase you have some feral cats in your neighborhood that you'd like to help keep warm for the winter...
http://www.pacthumanesociety.org/core/WinterShelter.htm
http://www.spayandstay.org/wintershelter.htm
http://www.springfarmcares.org/pdf%20files/Feral%20Cat%20Tote%20Shelter.pdf