Also known as Vaseline Glass. The first render simulates the glass under UV light, where as the second render is under normal light.

Both are textured using Lightwave 9.2's dielectric node. The "glowing" mushroom applies a thickness and incidence angle to the color to simulate how the light effects the glass in the real world.

Specs:
1 Area Light
1 HDRI
1 Spot Light (in the glowing version to help similate the glow from light passing through the glass and being dispersed onto the ground)
FPrime 3 render
4 Ray Bounces

Below is the version under natural light:
(Click to enlarge)