This script will take all selected objects and make them grey by default.
I get fed up with going into the colour picker to turn objects grey as I work through a blockout. I made this so that I could do it with a single click.
The script will work as a button in the toolbar once setup.
Installation:
This script takes all selected objects and makes their wireframe and base colour grey if no materials are applied.
To add it to your Max, drag the .ms file into the 3Dsmax viewport.