If you already have lamps then you can just change the lamp shades and this can affect the lighting. Lamp shades are a really cost effective way of doing things. Just keep it simple and experiment with different options.
Having said that if you do have the money to purchase some new furniture then that is a lot more fun. It is important to set a budget though prior to looking as you know what it is like when you are out shopping and you get carried away with what you see.
Consult your color wheel to choose an appropriate color scheme. Keep the colors in the same family unless your theme is rainbow. Sometimes contrast looks awesome. For instance a brightly colored, woven bohemian blanket would pop nicely against a modern, stark white couch.
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