Lamp shades are a great way of influencing light if you already have the right light fittings. You don't need to buy expensive lamp shades, just think about the likely effect on the room and make your decision from there.
Even if you inherited from Aunt Kay and you aren't particularly keen on the style you can invest in slipcovers for the upholstered pieces in a neutral fabric to unify the pieces, then use your creatively through accents.
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.
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