Paint the cement with cement paint. Make sure it is waterproof and designed for the outdoors. You can buy this from a home improvement store. The paint is resistant to bacteria, algae, mold and fungus.
Line the edges of the lawn with potted plants. Add bushes to the pots to bring volume and greenery to the lawn. Mix colorful flowers with lush, green shrubbery.
Place a swinging bench along an edge of the cement. This will give the area a light and playful feel because of the movement generated by the swing.
Place a traditional wood bench on the edge of the lawn area. The wood can distract from the bland look of the cement.
Place a patio table and chairs onto the lawn. A table with a colorful umbrella can liven up a cement lawn.
Lay ornaments such as gnomes around the plants to add more liveliness to the cement. Place a fountain in the area for a softer tone.