Random Material Colour Script

Hi there, I know this has been asked a number of times but I just can’t get it to work. I am a bit of a noob with coding so I can’t really code one myself. But does anyone else have a WORKING random colour script that I could use and be able to tell me in easy steps what to do to make it work? I have setup a prefab for the object I would like it to be done on and I have Unity 5.0.1 Personal if that means anything… Thanks, Matthew