I just carpeted my garage with a commercial grade indoor/outdoor carpet last Monday. I do miror repairs on my motorcycles in there, at most, so I'm not to concerned with possible damage or wear and tear, but if something gets on it, so be it. My garage is mostly a hangout when I park my bikes, watch TV, and drink beer. I know most would not recommend any type of carpet, but mine is not really a "working garage", but more of a "Man Cave" and carpet just seemed like the way to go.
I'm sure there a lot of folks here that may consider this taboo and not even a "real" garage anymore, but like I said, it works for me and my purposes.
Here are a few shots....