Choosing a good colour scheme that will work throughout the whole house is essential. It feels so much calmer in a house where colours flow smoothly from one room to another. Don’t try to change to a completely new colour scheme, or everything will need replacing – just look at the colours that already exist, choose three that blend nicely, and remove all other colours from sight.  In this example house, the sofas were red, so this was the starting point…http://www.homemakeoverservice.co.uk/e14.php
colour scheme

Reds and greens were used effectively here

colour scheme

Just the greens were carried through into the Conservatory