In addition to AI, one aspect of Unity 3D that I'm trying to master is custom shader creation. Here are some examples of my first shaders. In my examples, I created a simple shader (w/o properties). In the photos which that shader is applied, the warrior model appears in all white.
On top of the simple shader, I created a Texture/Bump Map shader, a Specular Shader (applied to armor), an Emission Shader (applied to the sword radiating a molten glow), and an Alpha Shader (applied to the Warrior's hair & fur trim). You can find the code to all of the shaders in my github.
I still have a ways to go mastering shaders, but I have a good beginning. I will probably need a lot of time to pore over Unity's Shader Reference documentation.
Later on, I would like to create some Toon Shaders. So, that will come in time.