Possibly going into my final for that class...

I was attempting to make a crystal asteroid for my final project (A scene in space... dhurr, I'm original...). It started with a sphere that I beveled and extruded the hell out of. The materials would make it clear... but I wanted it to react like a crystal, bouncing light. It started with a custom refractive raytrace material. Then I added a reflective raytrace...

... this rock is the result of that. A rock that not only reflects around it, but also reflects within itself...