Reflection

Using a cubemap for reflection

Reflection High Quality

A few more ways to manipulate a reflection, such as texture distortion, saturation and contrast.

Refraction 

Using a cubemap to fake refraction on a surface

Refraction High Quality

Chromatic Aberration and Reflection/Refraction masks

Skyboxes

Using a cubemap to create a skybox

Ambient Cubemaps

Using a cubemap to fake Ambient Lighting.