Yes. In the tradition of video game modding, this kind of color modification is called "chams". I designed these chams. Most useful is having teammates bright cyan so I know where not to shoot to avoid friendly firing, and having red heads and yellow bodies on the special infected baddies. I usually have workshop skins for the weapons instead of blue, and since the Last Stand update, the common zombies are wearing normal clothing on all the Left 4 Dead 1 campaigns. You could turn down how intense and ocularly carcinogenic the colors are without any loss to how much they help.
@@DontMockMySmock In co-operative mode, nobody cares. Maybe it helps you get better stats than your teammates, but it also helps keep the team alive. In versus mode, the rule used to be that skin mods are allowed, so all the good combatants were using skins for visual help and these are simply the brightest and best ones for that. At that time, there were some servers where skins aren't allowed and everyone has to run a mod that confirms that they're not using skins. After a while, mods were no longer allowed in versus, but then people figured out how to cheat that detection and still run mods
