Also Known as Wall-e from the Pixar animation movie.
Well this was an interesting project that djsures did on instructables. The project can be found here. He took a Wall-e that he purchased at toys'r'us and put together an autonomous Wall-e. Here is a link showing Wall-e work. He added personality to a toy that was otherwise lifeless. The project provides enough information to build the Wall-e, the only information not given is the code to program Wall-e. Overall it is a nice project and with a little imagination maybe you can turn some of those toy robots lying around into real movable robots.