Here is an example of a simple design element having a pretty big impact. The photo on top shows the concrete walkway going straight from the house to the garage, bisecting the yard. The problem with a straight path is that your eye follows a straight line really quickly and moves automatically to the end, ignoring everything along the way. This path originally went back to the alley making the problem even more exaggerated, but we removed it a few years before these photos were taken.
By changing the straight path to a simple curve you can add a lot more depth and even a little intrigue. Below it is the same concrete path broken, and rearranged, in a slight curve. The final photo show the landscape a couple of years later, after some plants matured.