Ok I use the word "hobbies" loosely, I know it is well more than that for most of us, from a strong interest to a passion to a near obsession and everywhere in between.
That said, I am always interested to see what others are into.
I'm into muscle cars and guitars for a couple, I am a union carpenter by trade and make alot of things on CNC, here are a few examples.
I do make some pretty good $$ sometimes but often I make things because I can, and sometimes simply give things away, but its nice to take something you have in your brain and create it. My main materials are wood [of course] plexiglas and corian but use quite a variety besides that including metals, foams and all sorts of plastics.