Upper Left:
AWESOME
uses texture mapping
cylinders, sphere are refractive and reflective
both pillars and sphere have caustics
beers law shadows

Lower Left:
AWESOMER
refractive nested objects
cube is refractive and reflective, with various colored lights.
it is in the corner of three reflective walls

Upper Right:
AWESOME-Y
Uses Cel Shading
Everything is flat-shaded.

Lower Left:
SUPER AWESOME
Reflective and Refractive spheres in a box formation.
There is a point light source inside the box.