One of the great things about the Blender community is they like to give stuff away. Blender is an Open Source program which means the code and application itself is freely available. This engenders similar acts from Blender users. Many people will make their models, animation rigs, textures, etc. available to anyone. I spent some time looking for a good plastic material and came upon the
Blender Open Material Repository. I didn't find a plastic that I liked, but some of the materials made for interesting Minimates.

Gold

Hot Metal

Ice

Soap Film

Mixed Metals

Honey

Red Tinted Glass
You'll notice in some of the transparent images that I didn't model the interior of the torso block. It's on the task list.