If your side driveway is located near a wall or you have a family member who tends to miss the driveway when they pull in, you can still spruce up the spot by sticking with grass. Plant a tall ornamental grass along the edge of your driveway to give it a greener look. Ornamental grasses come in a variety of colors, and some species of grass maintain a decorative look even after they've gone dormant. Plant a single row of the same species along the edge of your drive or mix it up for a more multicolored effect.
If you've got extra spaces along the edge of your side drive, plan a border. You can create a simple plant border by installing a variety of plants in a planned manner along the edge of your drive, or you can make a raised flowerbed which runs the length of your driveway and fill it with plants. Plant a single row of plants for a well-manicured look, or place a profusion of flowering plants in the spot to mix it up and add some color.
For a bit of flowering, easy-to-maintain appeal, shrub up your driveway. Plant a single type or a variety of flowering shrubs next to your driveway to add color and a flowery scent to the space. Be sure to pay attention to how large your shrub will grow, and plant the shrub far enough away from the drive itself that it won't take over the driveway. Planting large shrubs can also help hide or showcase a side driveway, depending on how they're situated.