I came across this paper in the European Journal of Physics:
"First-person visualizations of the special and general theory of relativity", U. Kraus, Eur. J. Phys. v.29, p.1 (2007).
The author presents a description of a class in which he tries to impart a visualization of various aspects of Special and General Relativity. I suppose this can make the conceptually-difficult aspects of Relativity easier to illustrate. But what is neat is that he also have a website that has all of these illustrations.
You can check out all the visualizations yourself. Some of them are in German, but from what I've read, more English versions are coming.
This website might be useful to students trying to learn Special and General Relativity.