Happy Cubes

Ok. So it didn't take too long to make a Cube class, and I'm pretty happy with it. It includes a list of colors that the cubes' tops can be and a variable that indicates which of those colors is there. The Cubes look pretty good (more after the jump):

(Looking at this picture, I wonder whether the cubes are too tall - comments welcome.)

I've also put these into a two-dimensional list, of sorts: the variable listOfCubes is actually a list of rows, each of which is a list of Cubes on that row. This way, if I need to access a specific cube at a certain position on a certain row, I can do so easily. The next step is to get Qbert to appear and jump around on the cubes - that should be more of a challenge!