Normal Lit Scene with a shader applied to the three objects.  Shader changes the Alpha value of the color material depending on the lookat vector of the camera.
A soccer ball model rendered in wireframe mode.
The same soccer ball rendered in wireframe mode with all of the normally obscured edges omitted.
The same soccer ball rendered in wireframe with "halos" around the front lines.
A scene rendered with fog using the OpenGL fog mode.
Floor texture replaced with a sinusoidal pattern using a fragment shader.