I would go for a splash of colour as the rest of the colour scheme looks a bit pale. Maybe deep red sofa with nice colourfull cushions to make a space more cheerful. Lovely big rug to match all the colours in the room, dark red, white, black, grey. Some nice lighting preferably crystal chandelier to add sophistication to a room and some art work on the walls.
Nice warm yellow would go nicely with grey units.
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