I had a beige Sunny with Brown/Beige interior so I'm not wholly averse to such things... When it comes to this particular car, I can cope with the brown dash/plastic trims and just cope with the carpet, but the brown on the seats tips it over the edge and is just wayyyyy too much!
I think replacing the brown centre console for a grey one would break it up a bit and so would simply removing that god awful steering wheel cover. Mats that tie in with the pale weave on the door cards would do wonders as well