Added a complex holder for human mobs + example icons (for an unadded species)

code/modules/mob/holder.dm

@@ -1,3 +1,5 @@
+var/list/holder_mob_icon_cache = list()
+
 //Helper object for picking dionaea (and other creatures) up.
 /obj/item/weapon/holder
 	name = "holder"
@@ -86,3 +88,42 @@
 	grabber.status_flags |= PASSEMOTES
 	H.sync(src)
 	return H
+
+/obj/item/weapon/holder/human
+	icon = 'icons/mob/holder_complex.dmi'
+	var/list/generate_for_slots = list(slot_l_hand_str, slot_r_hand_str, slot_back_str)
+	slot_flags = SLOT_BACK
+
+/obj/item/weapon/holder/human/sync(var/mob/living/M)
+
+	// Generate appropriate on-mob icons.
+	var/mob/living/carbon/human/owner = M
+	if(istype(owner) && owner.species)
+
+		var/skin_colour = rgb(owner.r_skin, owner.g_skin, owner.b_skin)
+		var/hair_colour = rgb(owner.r_hair, owner.g_hair, owner.b_hair)
+		var/eye_colour =  rgb(owner.r_eyes, owner.g_eyes, owner.b_eyes)
+		var/species_name = lowertext(owner.species.get_bodytype())
+
+		for(var/cache_entry in generate_for_slots)
+			var/cache_key = "[owner.species]-[cache_entry]-[skin_colour]-[hair_colour]"
+			if(!holder_mob_icon_cache[cache_key])
+
+				// Generate individual icons.
+				var/icon/mob_icon = icon(icon, "[species_name]_holder_[cache_entry]_base")
+				mob_icon.Blend(skin_colour, ICON_ADD)
+				var/icon/hair_icon = icon(icon, "[species_name]_holder_[cache_entry]_hair")
+				hair_icon.Blend(hair_colour, ICON_ADD)
+				var/icon/eyes_icon = icon(icon, "[species_name]_holder_[cache_entry]_eyes")
+				eyes_icon.Blend(eye_colour, ICON_ADD)
+
+				// Blend them together.
+				mob_icon.Blend(eyes_icon, ICON_OVERLAY)
+				mob_icon.Blend(hair_icon, ICON_OVERLAY)
+
+				// Add to the cache.
+				holder_mob_icon_cache[cache_key] = mob_icon
+			item_icons[cache_entry] = holder_mob_icon_cache[cache_key]
+
+	// Handle the rest of sync().
+	..(M)