Hello Colin, Thats a great question. From what I was able research, the predominant color was dark grey, or panzer grey. Most, but not all, were given a base coat of primer red, a rust prohibiting kind, like they used on their panzers. I would imagine they were in other colors as well, like a dark green perhaps. You would think, some would be painted in a sand color, to match the beach, but I have never seen a photo of them. Whatever color they started out as, they probably turned out looking like this photo
View attachment 138793Of course, that would depend how long they were in the area. Hope this helps a little. Regards, SG