This is a really BEGINNER tutorial on modeling Cowboy Hat. Modeling time is about 10-20 min tops. So, if you are willing of learning Rhino you should refer to this tutorial.
Here, you will learn how to model a tire with threads. Yet another non total beginner tutorial. You'll have to know some basis of Rhino. But still easy to follow.
In this short tutorial (it takes only a couple minutes to complete) we are going to show you how to use the electric map plugin from Blur Beta to make a rusty material.