Version: Unity 6.1 Alpha (6000.1)
Language : English
Set the Rendering Mode in the Standard Shader using a script
Customize the Standard shader source code in the Built-In Render Pipeline

Standard Shader realistic settings in the Built-In Render Pipeline reference

Use these charts as reference for realistic settings:

There are also hints on how to make realistic materials in these charts. In essence it is about choosing a workflow (default or metallic) and obtaining relevant values for your maps or colour pickers. For instance, if we wanted to make shiny white plastic, we would want a white Albedo. Since it is not a metal we would want a dark Specular (or a very low Metallic value) and finally a very high Smoothness.

Reference Chart for Metallic settings
Reference Chart for Metallic settings
Reference Chart for Specular settings
Reference Chart for Specular settings
Set the Rendering Mode in the Standard Shader using a script
Customize the Standard shader source code in the Built-In Render Pipeline