I tried my hand at making some simple dungeon tiles. They are made from a material similar to foam core, but without the paper. The pieces are cut to size, scored with a pen, and then rolled with a wad of aluminum foil to add texture. The tiles had a tendency to curl because of the scoring, so I glued each one to another unscored piece. The pieces were then primed and given two highlights. All in all, I think they turned out really well. The project cost less that $15 and only took a few hours. Here is an action shot.