Simple 3D graphics project?

In university, for my parallel programming course, I did an openGL/MPI implementation of Conway's Game of Life. It was quite interesting. Wish I still had the code around somewhere. The advantage of using open GL is that you can lay out the grid in different orientations rather than a flat grid. Remember, code doesn't exist until it's checked into source control.

Putting some physics in makes it more interesting. How about implementing Labyrinth (the maze toy where you are supposed to guide a ball from the starting point to the goal by tilting it).

EDIT: Erik told me it's called Labyrinth.

A 3D text/code editor. Text is 3D, errors stand out, code indentations not only indent, but protrude on z axis, pages/files are 3D and can be flipped like a ringpad.

Probably not useful, but fun and more interesting than a game IMO.