Just about anything can be composted. Some things may take longer to break down but if it came from the earth it can be returned.
Check out this sticky at the top of the compost section. It has many different things you can compost in there.
Remember composting is pretty easy you can set and forget or you can be as accurate and labor intensive as you want. But there is really nothing to it.
Mother nature compost millions of tons of organic matter every day without ever turning it or checking that the right materials are in there. I guess you could say she follows the set and forget way of composting.