I would suggest medium color hard wood floors. A warm medium finish would look nice. If you want carpet, a medium green would be best, possible light blue.
I would opt for a color combination somewhere between the dark green and the off white. You could have mottled flooring with swirls of green and off white coloring.
Honey oak color Parquet flooring would be gorgeous. If painted, a dark chocolate brown would be nice as well accented with off white or cream throw rugs.
I think that medium gray marble floor tile, either imitation or real marble would go very well. Keep in mind that wood-grain floors are neutral and go with everything.