Waffle Blender

Select any 3 images.
Select desired tile  size (8,16,32,48)
Blend to generate the tileset.
Download the resulting tileset....

You will need to crop the downloaded image... but it is ready to go.
You can download the JSON for use in autotiling...
The download link is for the JSON file.
The JSON is an array of arrays ...
one for each tile, and each tile is as ...
[center,topleft,topright,botright,botleft] ....