This is so easy to make. So if you can't make it. I'll make it free modeled. Give me some credit if you use it.

How do I change the color/colour? 
Well this is easy. Go To The View Tab.. Click on the Explorer and the Properties.  Go To the union. Separate it. (by going to the model tab) Separate the Negative Part. Change the color. Negate it. Change the color of the Part.  Select the Part and the NegativePart Together And union them.Read More