Finishes snowy stuff, adds overlays etc

code/game/objects/effects/overlays.dm

@@ -52,3 +52,45 @@
 	..()
 	pixel_x += rand(-10, 10)
 	pixel_y += rand(-10, 10)
+
+/obj/effect/overlay/snow
+	name = "snow"
+	icon = 'icons/turf/overlays.dmi'
+	icon_state = "snow"
+	layer = 10
+
+/obj/effect/overlay/snow/floor
+	icon_state = "snowfloor"
+
+/obj/effect/overlay/snow/floor/edges
+	icon_state = "snow_edges"
+
+/obj/effect/overlay/snow/floor/surround
+	icon_state = "snow_surround"
+
+/obj/effect/overlay/snow/airlock
+	icon_state = "snowairlock"
+
+/obj/effect/overlay/snow/floor/north
+	icon_state = "snowfloor_n"
+
+/obj/effect/overlay/snow/floor/south
+	icon_state = "snowfloor_s"
+
+/obj/effect/overlay/snow/floor/east
+	icon_state = "snowfloor_e"
+
+/obj/effect/overlay/snow/floor/west
+	icon_state = "snowfloor_w"
+
+/obj/effect/overlay/snow/wall/north
+	icon_state = "snowwall_n"
+
+/obj/effect/overlay/snow/wall/south
+	icon_state = "snowwall_s"
+
+/obj/effect/overlay/snow/wall/east
+	icon_state = "snowwall_e"
+
+/obj/effect/overlay/snow/wall/west
+	icon_state = "snowwall_w"