Perfect square tile need help

Could someone make a tutorial on : how to create perfect square tile (custom tile)

You can use this to make a square: https://tmmm.forumotion.com/t217-how-to-make-and-use-a-custom-tile

From the example in that post:
The blue tiles would need to be L shaped (like the edges of a square)
The light blue would need to be the same as the red or orange
The green would need to be lines
The yellow probably wouldnt work, so you couldnt be able to make a square that goes diagonally, you can do some testing, it might work out

If you look at the upper right part of the pic i posted in that thread you can see the rectangle i made out of that example, you can use that as a reference for how a square would work


Or you could just make everything except the red and orange transparent, but that will cause terrain related triggers to be a offset by alot

I already try to make it but it always making a normal tile and i never get a square i dont know if you could send me an exemple like a tga file with the type of path you use for it.