I have thought about games. In fact, I've even built several games in perl (althouhg not OO), like tetris, minesweeper, battleship, etc. So, just as an excersize in OO, I am currently working on rewriting Tetris in Java, and, most likely afterwards, in OO-Perl again.

However, all this is to say that a game will most likely not suffice for a project. The Professor mentioned that our projects should contain on the order of -teen- or so classes, and what he is looking to get out of this is our abilities to deal with the design aspects of medium sized projects. (I should have mentioned that this is going to be a collaboration between two people).