My style has a large emphasis on neutral tones and pieces that are classic so that they can be moved anywhere and last for years. Living in the tropics lends itself to bright colours. Painting walls is one way to transform a living space, but for those renting it is not necessarily an option. Painting a door is a possibility as it is easy to return to the state it was taken over and not so costly.
In using colour, My rule is 80% neutral tones in a room and 20% colour so that the colour doesn't overwhelm the room. I personally tend to avoid brightly painted pieces of wooden furniture (found in many Asian inspired furniture) as then the room is dictated by the colour of the furniture and it tends to date quickly.
Using colour in upholstered fabrics on chairs or ottomans are a great way to add a pop of colour to a room as are ceramic lamp bases, lamp shades and rugs.
However, there are smart ways to add colour with minimal expense