putting the line
SHELL = "GREEN";
(or another colour)
at the end of color.ini should be all you need to do. Oh, and make sure the line
#include "color.ini"
is in doomrl.ini and not commented out.
here's my full file:
// Custom coloring based on entity ID's. Search the DoomRL wiki
// for id's for entities. Colors can be:
// BLACK, BLUE, GREEN, CYAN, RED, MAGENTA, BROWN, LIGHTGRAY, DARKGRAY,
// LIGHTBLUE, LIGHTGREEN, LIGHTCYAN, LIGHTRED, LIGHTMAGENTA, YELLOW, WHITE
[Colors]
//most of the LIGHTRED is because RED is hard to see, at least for me - Rahul
RARMOR = "LIGHTRED";
CYBERDEMON = "LIGHTRED";
ANGEL = "LIGHTRED";
CHAINGUN = "LIGHTRED";
CAPTAIN = "LIGHTRED";
COMMANDO = "CYAN"; //match his rifle
BARON = "MAGENTA"; // looked like a bruiser, and can't change that one
DEMON = "LIGHTMAGENTA";
CACODEMON = "LIGHTMAGENTA";
MOD_POWER = "LIGHTRED"; // avoid conflict with the exotic mods
MOD_BULK = "LIGHTBLUE";
//shotgun(ners) were hard to distinguish from the pistol(ier)s and each other
SERGEANT = "GREEN";
SHOTGUN = "GREEN";
SHELL = "GREEN";
DSHOTGUN = "YELLOW";
//pistols etc. blend into the walls
FORMER = "WHITE";
PISTOL = "WHITE";
AMMO = "WHITE"; //10mm
SHGLOBE = "LIGHTRED"; //the health globes are coloured to match the health packs
LHGLOBE = "RED";
BPACK = "MAGENTA"; //berserk pack
MSGLOBE = "CYAN";
SCGLOBE = "LIGHTBLUE";
HPHASE = "CYAN";
PHASE = "LIGHTBLUE";
NUKE = "MAGENTA";
hopefully that'll help you to make the changes you want :)