R drawflat
From The MegaTF/TeamFortress Wiki!
r_drawflat
r_drawflat is an EZQuake command that increases visibility by replacing the map's floor and wall textures with solid colors of the user's choice.
r_floorcolor and r_wallcolor accept RGB (Red,Green,Blue) values, allowing the user to customize.
This can be helpful in game modes like Midair
Example:
r_drawflat "1" r_floorcolor "12 25 38" r_wallcolor "11 11 11"