Function GetPlayerColor gets the color of the player's name and radar marker. Only works after SetPlayerColor.
GetPlayerColor will return nothing (0) unless SetPlayerColor has been used first. Click HERE for a fix.

int playerid The ID of the player to get the color of.

Return Values:
The player's color. 0 if no color set or player not connected.

SendClientMessage(playerid, GetPlayerColor(playerid), "This message is in your color :)");
new output[144];
format(output, sizeof(output), "You can also use the player's color for {%06x}color embedding!", GetPlayerColor(playerid) >>> 8);
SendClientMessage(playerid, -1, output);
// will output the message in white, with ''color embedding'' in the player's color

Related Functions
The following functions may be useful, as they are related to this function in one way or another.