First and second folder replace Defaults or Green in MBP. Green will make it "freeze" during Time Travels. I recommend it.
The other 4 are for any purpose. I personally like the old MBP numbers better than the new one.
I have included the original Old MBP Blue, and added a recolored Red, Yellow and Green. I am not making "Frozen" Old MBP textures.
- maingi