Porting updates related to material datums. (#12317)

* Porting updates related to material datums.

* art_type

* oh oh

code/game/objects/effects/contraband.dm

@@ -51,6 +51,7 @@
 	icon = 'icons/obj/contraband.dmi'
 	plane = ABOVE_WALL_PLANE
 	anchored = TRUE
+	buildable_sign = FALSE //Cannot be unwrenched from a wall.
 	var/ruined = FALSE
 	var/random_basetype
 	var/never_random = FALSE // used for the 'random' subclasses.
@@ -69,6 +70,8 @@
 		name = "poster - [name]"
 		desc = "A large piece of space-resistant printed paper. [desc]"
 
+	addtimer(CALLBACK(src, /datum.proc/_AddElement, list(/datum/element/beauty, 300)), 0)
+
 /obj/structure/sign/poster/proc/randomise(base_type)
 	var/list/poster_types = subtypesof(base_type)
 	var/list/approved_types = list()