Well the appropriate term is more of replace, because you will still have missing textures but with a very much less bright and noticeable material. What it does internally is it goes through the map file and make sense out of it.

i like very much

have textures of every game that could be mounted to garrys mod but that takes a while to do

having all mountable tex's would be illegal

bacically instead of purple checkerboards its gray and less painfull to see

good work

@ 75th Ashes2007

It's not illegal to have the textures, as long as you don't remake the game they came from it's fine.

Instead of purple checkers it's the grass texture