[KissLick]

In layman's terms:

Plugin developers are not supposed to use actual colors, but variables which can be easily set by server masters.

How does it work?

1. Create a plugin with ColorVariables
2. Use color variables in chat messages and not actual colors
3. Optional: If you need some new variables, create them with CAddVariable
4. Optional: If you want, you can create a forwarded variable for other plugins to use (like {@isRebel CLIENT_INDEX}, {@rank CLIENT_INDEX}, {@rainbow} etc.)
5. Optional: If you want to use variables from other plugins, load them with CLoadPluginConfig or CLoadPluginVariables (If server master renamed plugin binary, this won't work!)

Quick example:
Normal: PrintToChatAll("\x02[prefix]\x01 %N gave you \x03AK-47\x01!", client)
ColorVariables: CPrintToChatAll("%N gave you {highlight}AK-47{default}!", client)

ColorVariables plugin example:

PHP Code:

#include <colorvariables>

public OnPluginStart()
{
    CSetPrefix("KillInfo"); // Set plugin chat prefix to "KillInfo" (will be used in every print function)

    HookEvent("player_death", Event_PlayerDeath);
}

public Action:Event_PlayerDeath(Handle:event, const String:name[], bool:dontBroadcast) 
{
    new victim = GetClientOfUserId(GetEventInt(event, "userid"));
    new attacker = GetClientOfUserId(GetEventInt(event, "attacker"));

    CPrintToChatAll("{player %d}%N {default} killed {player %d}%N", attacker, attacker, victim, victim);
    // {prefix}[KillInfo] {teamcolor}Will {default}killed {teamcolor}Mark

    CPrintToChat(victim, "{highlight}Player {player %d}%N {highlight}killed you!", attacker, attacker);
    // {prefix}[KillInfo] {highlight}Player {teamcolor}Will {highlight}killed you!

    return Plugin_Continue; 
} 


More info, full feature list and download in GitHub repository.