If you are looking for inspiration when designing encounter maps may I make a recommendation?
Take a hike.
That’s right, get out into nature. Go to the source and see what things really look like. Then decide if it makes sense for a square to be difficult terrain or not? Does light foliage really grant concealment? If you really want an answer to these and other questions, take a walk through your local forest. Your eyes will be opened to a new set of possibilities and you might discover a new past time.