This is the filth-mod without the filth.
Just the path making part.
Grass turns to dirt. Some nodes (sand, desertsand, gravel, dirt, grass, cobble, mossy cobble) change into each other, depending on what you walked on before.
Github: https://github.com/CasimirKaPazi/paths
Download: https://github.com/CasimirKaPazi/paths/archive/master.zip
Depends: nothing
License: GPL
Outdated versions:
Version without extra nodes:
http://ompldr.org/vaGFjZw/paths20130128.zip
Version with extra nodes):
http://ompldr.org/vZnV2dQ/paths_20121012.zip