I just thought this could speed up the long and drawn out process of detailing levels...obviously it wouldn't look quite as good as normal levels, but it would be close. My idea is that there should be a tool in the level editor where you choose a tile,and you select an area in the level, and you put in the % of what tiles (default is the plain green tile) you want filled in with what you select. Then it would go through the selected area and "detail" that percentage of the green tiles, or whatever else, with the selected tile.
I just think it would be really useful o.O...