One way you can is to script your own input:on *:INPUT:#: {
if (/* !iswm $1) && (!$ctrlenter) {
echo -t # $+(<,$cnick($me).color,$nick(#,$me).pnick,>) $+($chr(3),04,$1-)
.msg # $1- | haltdef
}
}
See 04 means red in mirc color. All you have to do is change it to correspond the color you want from 01 to 15