I used the term unconventional since it is not quite mainstream yet, but getting there. I've heard it called "underground" or "hybrid" but I prefer the simplicity of "unconventional."
I'm talking about the use of odd objects, strongman techniques, and unique training variations as primarily secondary exercises. In my opinion, it there is no substitute for the primaries: squat, deadlift, bench, cleans, etc. However I find that athletes respond well both mentally and physically to unique training styles. I'm always looking to learn so please post your thoughts!