Question
Hello, I have a very flat front yard. I recently had a beautiful paver walkway with nice rounded design from the front door angled to the driveway. I want to outline the walkway with like a 24" outline of some plants and/or flowers, but the bed will be completely flat also. Do I just did a trench lower than the side by the pavers to give it some sort of nicer look. How deep should I do the trench and is that enough for a border or do I need that expensive landscape edging. I was going to have new topsoil delivered as well as mulch. Any ideas are appreciated. Thank you.

Answer
I don't quite understand what you mean by "trench".  I would not dig deeper than half the thickness of your new paver walk (so if the brick is 4" thick, no deeper than 2" to avoid having the thing unravel).

Here are images of two flat planters (they look about 2 ft. wide):  http://www.flickr.com/photos/ac5p/439204201/
http://www.flickr.com/photos/24081273@N05/2302147831/

You can edge the planter on the outer side, and you can also raise the height of the planter by a few inches (probably no more than 6-8 inches) to better define the path.   The cheapest thing you can do is move dirt around.  It is mostly personal taste and preference.

I like the look of a clean edge defining beds and lawn.  It isn't all that expensive, if you use recycled lumber edging, special black plastic lawn edging, and finally the more expensive concrete edging.

Hope it helps.  ~M