Adds a graffiti spawner for PoI and general map-making.

code/game/objects/effects/spawners/graffiti.dm

@@ -0,0 +1,28 @@
+/obj/effect/graffitispawner
+	name = "old scrawling"
+	icon = 'icons/effects/map_effects.dmi'
+	icon_state = "graffiti"
+
+	var/graffiti_type	// The text string for the desired icon state of your graffiti.
+
+	// If the effect's color is not set, it will be chosen at random.
+	var/color_secondary	// The hexcode for the desired secondary color of your graffiti. If blank, it will inherit this effect's color.
+
+/obj/effect/graffitispawner/Initialize()
+	..()
+
+	if(!color)
+		color = rgb(rand(1,255),rand(1,255),rand(1,255))
+
+	if(!color_secondary)
+		color_secondary = color
+
+	if(!graffiti_type)
+		graffiti_type = pick("rune", "graffiti", "left", "right", "up", "down")
+
+	var/turf/T = get_turf(src)
+	var/obj/effect/decal/cleanable/crayon/C = new(T, color, color_secondary, graffiti_type)
+
+	C.name = name
+
+	qdel(src)