Any one ever make a hill on a very flat piece of property to add some texture to a yard. Here's the thought. It's a 1acre lot, back 1/3 is still natural wooded. Lawn area is just paper flat. Was considering building up a "hill" one corner. about 4-5 feet tall at the highest point, although not a true circle, about 25-30 foot kidney shape with the highest point offset towards the back of the circle. In my head it looks really nice... But does this sound like a good or bad idea to any one else?