Small update:
I didnt make any major progress on the graphic set, i'm feeling really sick these last days but i still made some testing.
I only worked on the grass, wich i wasnt sastified for many reason. Every grass i did make so far was bland and made all the biomes looking the same. Those grass didnt use all the potential from tWBT, and since this graphic set is a test to see what we are able to do with it, i thought i should use more overides for the grass.
The grass didnt fit on many biomes too, like for example, the rocky wastleland. I was tired too to see the same green over and over, the exterior lacked some 'personality' if i can say so. So i went in the raws and gave every grass their own tile, and plan to make unique tiles for each one of them. I only did made 9 of them so far. With this every biomes would (i hope) kind of get a different look.
And to make every tiles kinda unique i had to use more colors, so Mifki proposed to use white as foreground color, so i could directly color the tiles. It kinda works, but you have to make the tiles way darker then you want, because in-game they would be lighter. Si i had to see many times in game to see if the tiles had the color i want.
My grass tiles are not great but it kinda show that this could be possible, and hope if there anyone toying with TWBT would try something like this. I did google every grass to try to get the real look they have but its too hard for me, i tried the best i can. Some grass do have the same look, so i tried to use some different color so they would be distinguable.
A screenshot to show how this look in-game:
What i like with this, is that you have more colors to play with and give the grass a more wild look.
HaterSkater proposed too, to have TWBT look for tile and color for overides. If Mifky implement that, i think it would be possible to do the same for leaves. Having more colors in them and variety of shape depending on the trees.