Thanks all.
@robertwahler: Yes, Tiled is a good example.
@unikronsoftware:
You can use the tk2d tile map editor for all the regularly spaced apart bits, and simply place normal sprites in the scene where you need them.
Does placing normal sprites mean placing prefabs of the sprites on a stage? In tk2d TileMap implementation, each tile placed is not a prefab but a data which will be loaded to construct a map, isn't it?
Like TileMap view (Paint/Color/Data/Settings), I would like to select a sprite from sprite list, and locate it to a map.
Is it a reasonable feature? If so, I will try to see your code to make a customized one.