CAD has come along way in the past few years. Today it is possible to develop a plan, then create an artist impression all within the software program.

One of my favorites is to take a background picture of an area and then show how the planting might work, as you can see below.

 

English perennial 1

You can even add people and furniture Round patio

 and developing a symmetrical layout is even easier

Symmetrical perennial half

Symmetrical perennial