I came up with a Gym Styles P90X-like rotation (I posted it in the "rotations" forum, but it was quite a while ago), and I did it for about 4 weeks.
As I expected, I didn't get near the strength gains as I did with P90X (the sequence of exercises and the stretches incorporated without in the workouts in P90X are key, I believe), but the lower body results were better. Nothing Earth-shattering or to make me go "wow," BUT I didn't stick with it as long as I did with P90X (I did the whole 90-day rotation...even though it took me about 110 days to do so!).