As colour is always highly personal, there is no single recommendation when it comes to paint colours for small rooms. However, choosing a lighter colour above your eye level creates an airy effect that can visually heighten walls.
Lighter colours can also make a room look larger and taller, especially in a small room or a room with a lower ceiling. Simply paint the ceiling with a lighter shade, or a slight variation, of the wall colour. The subtle contrast brings depth and dimension without breaking the unity of existing colours. Generally speaking, a flat finish is a common choice for ceilings.