My second addition for the the day is bamboo. bamboo has two qualities. If a person is adjacent to it and is being targeted from a nonadjacent figure, all small, medium and large figures get +1 defense if the line of site passes through the bamboo (so different than jungle). Also, small and medium figures can pass through (but not stop in) a bamboo tile. Large or Huge must go around. These types are cheap and easy to make.
Thoughts!