Design the outer edge of the yard to accommodate a flower bed or planter. Keep the yard from looking too uniform by creating a scalloped edging around a curb, wall or driveway and adding in a variety of plants with different colors and heights. To increase height in the landscape, add a raised flower bed along one edge of the yard or near the foundation of the home.
Plant ornamental grass along the property lines to add dimension to a flat yard and increase privacy if there is no wall. Separate the plantings from other landscape areas by filling the bed with decorative rocks or ground cover.
Break up a large, flat backyard by installing a gravel or stone walkway from an exterior backdoor to a garden area in a corner or along the edge of the yard. Plant a variety of aromatic herbs or vegetables to create a small garden area in the landscape.
Add height to a flat yard by using soil to create soft mounds throughout the planter beds. Cover the various mounds with ground cover and set large rocks around randomly to create a natural appearance. Near the home or curb, plant small ornamental trees that fit proportionally with the home and size of the yard.
Install a concrete or stone patio in the center of a large yard, and then add plants and flowers around the patio to create a socializing area. On the patio, place a small fire pit and comfortable seating to use throughout the year.