Block walls are a quick, effective way of creating borders or new rooms to houses and relatively cheap to construct.  There are many different ways to personalise a wall for example, decorative clay or concrete blocks on top (celosia) to create an impresive finish.

Clad in stone, add trelis and allow plants to grow along it, or simply render and paint it if you are on a lower budget, either way a block wall is cheap, quick and effective