The best you can do is change the grout color, if you do not want to replace the tile floor.
You could install a floating laminate floor over the tile, (Check for post on the opinions of this) Personally I wouldn't put it in a dog house.
I would consider installing hardwood in all areas except the bath, if you go natural or a light stain the color will not go out of "style" like Whitewash or walnut stains. JMHO.
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