Let's go through one more exercise, just to make sure you've got the basics. I won't walk you through it this time, but let's add a tint to the diffuse color.
Create a new Multiply node and a Constant3Vector node, and hook them up just like you did for the Specular color. Pick a nice rusty orange color for the tint (1, 2). You should end up with something that looks like the following screenshot:
So, as you can see from the image above, we have added an orange tint diffuse color to our material, which is the finishing touch and now our material is ready to be used in our environment. The final section is to make our material easier to read in the Material Editor. So let's go ahead and polish things up.