At the moment for a path you either just have a dirt path made with the rake or you use blocks which if its a cobblestone path looks a bit weird (unless I'm missing something that is).
It would be great if there was a tool that you could use to do a texture overlay, that way you could create a stone path that blended in to the surrounding textures (just like using the hoe to create tilled soil) and followed the contours of the land. The tool could still have a cost so that it wouldn't get abused ie: 1 stone to use.