nice like the eyes but how is santa going to get through there!
As for the road sign post, IMO they would be too narrow to draw well. Think of the size of the flue on a woodburning stove...
Your local council depot will have loads of lamp posts that have been run over dung the holidays. Expect hassle to get one unless you go at night and take the bolt cutters.
OK sledge and flying reindeer then to go over the fence! I've eaten reindeer and its a bit greasy
the little signs ones are to small, but the bigger signs have 4" min mostly 5 or 6"
some old lamp posts (the short octagonal type) are about 8" they narrow down a bit but half way up there still pretty large.