To make a room appear cosier

Choose colours from the warm side of the colour wheel.
A sunny yellow will 'heat up' a room, but don't go overboard, complement it with a white ceiling and woodwork to keep it looking fresh.
A warmer shade used on the ceiling will bring the height of a room down and make it feel cosier.
When using bright colours such as orange and red, remember to maintain balance by keeping the floor and carpet neutral.

Other tricks

The far end of a long corridor will seem closer if painted in a darker shade.
In a long corridor-like room, paint the two, shorter end walls in a slightly darker shade to make the room appear squarer .