For conceptual drawings/landscape plans, you can adjust the visual style to resemble a rough sketch.
To adjust the visual styles
Line Extensions Edges controls the amount of overhang (line extensions) and Jitter controls the number of lines that are drawn.
This render style is scale dependent, so you may have to set an appropriate zoom level before you start the adjustment.
These styles are similar to the NAPKIN command options that create sketch effects, but these adjustments do not add additional entities to the drawing, they just display the styles differently.
Another possible use of visual styles is to display a surface as transparent. You can create a new visual style and set the global Opacity to a small number, or you can assign different kinds of glass render materials to the different surfaces and then render the drawing.