Textures can have a huge impact on the overall aura of the rooms. For example, in a textured room, the colors look like they have more depth. Whatever color you choose for your rooms, that color will look richer when it is textured. So keep this is mind, when choosing a particular, as textures will alter the perceived look of a color. You paint a wall textured, the color might end up looking completely different from what you had in mind.
Another property of textures is that smooth textures seem to recede away from you, and hard textures will make the room look visually congested. So small rooms are best painted in smooth textured paints, while rough textured paints will make a large dull room more rich and cosy.