The middle one is basically just a recolirisation of the green grass one. The third one is there to fix one issue with that tile set
But for that I need to show the tileset being used:
As much as I like the visible rectangle, this tileset cannot be used as is because the mid part of the tileset do repeat the line that should only be under the grass.
If we show the tileset only with 3 tile height, no problem, if we go further it don’t work.
For the third one I just extended the middle one up, then copy pasted the grass on top, and I really like how it look.
The grass would need a bit of tweaking for the repetition, but overall I like how it looks.