I present you FactoCAD, a mod that make the game look like a CAD software.
Basically this is a texture pack that makes thing have a schematic look and feel, should be playable and make things easy to understand, independently to artistic direction of Factorio.
Since factorio textures packs for the default stuff needs to have a mod to insert the texture and changes some values, I consider this not as a texture pack but a mod since everything is in a separate mod, so you don't have to do base or mod editing, the mod itself does that for you ...
The 0.0.4 release is pretty awesome because it is a bit "automatic" ... see this post for more informations : Texture pack toolkit
WARNING : If textures looks incomplete, then remove "crop-cache.dat" in your factorio directory and try again, if the problem persist, report it here. This is mainly because you've updated the mod and file references are the same between the old and new version but factorio has already crop the texture. By removing this, the game take longer to load once, don't worry about that.