Little Lamp That Adds The Touch
One of the easiest little things that you can do for your ambient is to add a little lamp in the corner of the room. When you are after more subtle ambient like when you're watching television, reading or having a glass of wine with your friends the ceiling lights are too bright and don't provide the gentle atmosphere we're after. You need to bring the light levels down and get some indirect light into the room.
The easiest solution is to put a lovely glowing light in the corner of the room like a small table lamp or floor lamp. If the room is big you might even put two or more but what you'll achieve is a low level lighting that suits the mood. Quick, easy and cost effective. Sounds simple enough however if you get stuck with choices or placements it's always a good idea to call an expert for help.