Because you love them individually, they will work when you use them together and achieve an inviting and comfortable feel to your room.
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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