Three years ago John and I went as the statue of Liberty and Mt. Rushmore. It was my favorite costume to make and was basically free, we were only out a can of black and green spray paint, and 2 sheets of foam board! We still have the mask and crown just in case we find ourselves in a costume pinch!
We have some friends who always come up with the best costumes ever... as you can see here:
And if you still are stumped for some fun make at home costumes try out some of these ideas:
Fantastic Mr. Fox
Cast of Mad Men