Here's an article that lists 163 things you can add to your compost pile, going well beyond the usual grass clippings and leaves. Now it includes some things that other folks don't recommend (e.g citrus peelings tend to decompose slowly so they are on some people's list of things to not add to the compost pile, but it is interesting reading, as it includes some unusual items such as

Bat and bird guano
Stale potato chips
Toenail Clippings
Old leather gardening gloves

You can see more materials for your compost pile at

http://www.plantea.com/compost-materials.htm